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Menstrual cycle

Index Menstrual cycle

The menstrual cycle is the regular natural change that occurs in the female reproductive system (specifically the uterus and ovaries) that makes pregnancy possible. [1]

155 relations: Acne, Alcohol abuse, Amenorrhea, American Family Physician, Ampulla of uterine tube, Androgen, Anna Glasier, Anovulation, Anovulatory cycle, Anterior cruciate ligament, Anterior pituitary, Ape, Barry Karr, Basal body temperature, Binge eating, Birth control, Blastocyst, Bleeding, Breakthrough bleeding, Breast pain, Breastfeeding, Calendar-based contraceptive methods, Canada, Carbohydrate, Catamenial epilepsy, Cervix, Chromatin, Clinical urine tests, Coagulation, Cocaine, Combined oral contraceptive pill, Committee for Skeptical Inquiry, Contraceptive patch, Corpus luteum, Crypt (anatomy), Developed country, Developing country, Dogon people, Dysmenorrhea, Egg cell, Embryo quality, Emotion recognition, Empathy, Endocrine system, Endometrium, Energy homeostasis, Enzyme, Epilepsy, Estradiol, Estrogen, ..., Estrogen receptor alpha, Estrogen receptor beta, Ethinylestradiol/etonogestrel, Etonogestrel birth control implant, Extended cycle combined hormonal contraceptive, Fallopian tube, Fat, Fear processing in the brain, Female reproductive system, Fertility, Fertility awareness, Fertility testing, Fimbriae of uterine tube, Follicle-stimulating hormone, Follicular phase, Folliculogenesis, GABAA receptor, Gonadotropin, Gonadotropin-releasing hormone, Goodman & Gilman's The Pharmacological Basis of Therapeutics, Greek language, Hormonal contraception, Hormonal IUDs, Hormone, Human chorionic gonadotropin, Human embryogenesis, Hypomenorrhea, Hypothalamus, Iceland, Immature ovum, Implantation (human embryo), In vitro fertilisation, Inhibitory postsynaptic potential, Iron deficiency, Irregular, Irregular menstruation, Joe Nickell, Latin, Levonorgestrel-releasing implant, Lunar phase, Luteal phase, Luteinizing hormone, Masculinity, Medroxyprogesterone acetate, Menarche, Menometrorrhagia, Menopause, Menorrhagia, Menstrual disorder, Menstrual leave, Menstrual synchrony, Menstruation, Metrorrhagia, Migraine, Mittelschmerz, Monkey, Mood (psychology), Negative feedback, Nervous system, Neurology, Neuron, Neurotransmitter, Nicotine, Norepinephrine, Obstetrical bleeding, Oligomenorrhea, Oocyte, Oral contraceptive pill, Ovarian follicle, Ovary, Ovulation, Ovulatory shift hypothesis, Paternal age effect, Pheromone, Pituitary gland, Plasmin, Polycystic ovary syndrome, Positive feedback, Pregnancy, Pregnancy rate, Pregnancy test, Premenstrual syndrome, Primate, Progesterone, Progestogen, Progestogen-only pill, Prolactin, Protein, Serotonin, Sex steroid, Sexual intercourse, Smooth muscle tissue, Spermatozoon, Standard deviation, Stress (biology), Subdermal implant, Suicide, Syncytiotrophoblast, Thyroid, Tobacco, Twin, United Kingdom, United States, Uterus, Vaginal bleeding. Expand index (105 more) »

Acne

Acne, also known as acne vulgaris, is a long-term skin disease that occurs when hair follicles are clogged with dead skin cells and oil from the skin.

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Alcohol abuse

Alcohol abuse is a previous psychiatric diagnosis in which there is recurring harmful use of alcohol despite its negative consequences.

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Amenorrhea

Amenorrhoea is the absence of a menstrual period in a woman of reproductive age.

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American Family Physician

American Family Physician is a biweekly peer-reviewed medical journal published by the American Academy of Family Physicians.

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Ampulla of uterine tube

The ampulla is the third portion of the fallopian tube.

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Androgen

An androgen (from Greek andr-, the stem of the word meaning "man") is any natural or synthetic steroid hormone which regulates the development and maintenance of male characteristics in vertebrates by binding to androgen receptors.

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Anna Glasier

Annabelle "Anna" Frances Glasier OBE, FFSRH, FRCOG FRSE is an English physician in the field of reproductive medicine.

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Anovulation

Anovulation is when the ovaries do not release an oocyte during a menstrual cycle.

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Anovulatory cycle

The anovulatory cycle is a menstrual cycle characterized by varying degrees of menstrual intervals and the absence of ovulation and a luteal phase.

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Anterior cruciate ligament

The anterior cruciate ligament (ACL) is one of a pair of cruciate ligaments (the other being the posterior cruciate ligament) in the human knee.

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Anterior pituitary

A major organ of the endocrine system, the anterior pituitary (also called the adenohypophysis or pars anterior), is the glandular, anterior lobe that together with the posterior lobe (posterior pituitary, or the neurohypophysis) makes up the pituitary gland (hypophysis).

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Ape

Apes (Hominoidea) are a branch of Old World tailless anthropoid primates native to Africa and Southeast Asia.

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Barry Karr

Barry Karr is the Executive Director of the Committee for Skeptical Inquiry.

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Basal body temperature

Basal body temperature (BBT or BTP) is the lowest body temperature attained during rest (usually during sleep).

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Binge eating

Binge eating is a pattern of disordered eating which consists of episodes of uncontrollable eating.

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Birth control

Birth control, also known as contraception and fertility control, is a method or device used to prevent pregnancy.

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Blastocyst

The blastocyst is a structure formed in the early development of mammals.

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Bleeding

Bleeding, also known as hemorrhaging or haemorrhaging, is blood escaping from the circulatory system.

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Breakthrough bleeding

Breakthrough bleeding (BTB) is any of various forms of vaginal bleeding,, in turn citing.

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Breast pain

Breast pain is a medical symptom that is most often associated with a developing disease or condition of the breast.

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Breastfeeding

Breastfeeding, also known as nursing, is the feeding of babies and young children with milk from a woman's breast.

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Calendar-based contraceptive methods

Calendar-based methods are various methods of estimating a woman's likelihood of fertility, based on a record of the length of previous menstrual cycles.

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Canada

Canada is a country located in the northern part of North America.

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Carbohydrate

A carbohydrate is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 (as in water); in other words, with the empirical formula (where m may be different from n).

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Catamenial epilepsy

Epilepsy is a chronic neurological condition characterized by recurrent seizures.

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Cervix

The cervix or cervix uteri (neck of the uterus) is the lower part of the uterus in the human female reproductive system.

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Chromatin

Chromatin is a complex of macromolecules found in cells, consisting of DNA, protein, and RNA.

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Clinical urine tests

Clinical urine tests are various tests of urine for diagnostic purposes.

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Coagulation

Coagulation (also known as clotting) is the process by which blood changes from a liquid to a gel, forming a blood clot.

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Cocaine

Cocaine, also known as coke, is a strong stimulant mostly used as a recreational drug.

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Combined oral contraceptive pill

The combined oral contraceptive pill (COCP), often referred to as the birth control pill or colloquially as "the pill", is a type of birth control that is designed to be taken orally by women.

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Committee for Skeptical Inquiry

The Committee for Skeptical Inquiry (CSI), formerly known as the Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP), is a program within the transnational American non-profit educational organization Center for Inquiry (CFI), which seeks to "promote scientific inquiry, critical investigation, and the use of reason in examining controversial and extraordinary claims." Paul Kurtz proposed the establishment of CSICOP in 1976 as an independent non-profit organization (before merging with CFI as one of its programs in 2015), to counter what he regarded as an uncritical acceptance of, and support for, paranormal claims by both the media and society in general.

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Contraceptive patch

A contraceptive patch, also known as "the patch", is a transdermal patch applied to the skin that releases synthetic estrogen and progestin hormones to prevent pregnancy.

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Corpus luteum

The corpus luteum (Latin for "yellow body"; plural corpora lutea) is a temporary endocrine structure in female ovaries and is involved in the production of relatively high levels of progesterone, moderate levels of estradiol, inhibin A and small amounts of estrogen.

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Crypt (anatomy)

Crypts are anatomical structures that are narrow but deep invaginations into a larger structure.

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Developed country

A developed country, industrialized country, more developed country, or "more economically developed country" (MEDC), is a sovereign state that has a highly developed economy and advanced technological infrastructure relative to other less industrialized nations.

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Developing country

A developing country (or a low and middle income country (LMIC), less developed country, less economically developed country (LEDC), underdeveloped country) is a country with a less developed industrial base and a low Human Development Index (HDI) relative to other countries.

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Dogon people

The Dogon are an ethnic group living in the central plateau region of Mali, in West Africa, south of the Niger bend, near the city of Bandiagara, in the Mopti region.

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Dysmenorrhea

Dysmenorrhea, also known as painful periods, or menstrual cramps, is pain during menstruation.

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Egg cell

The egg cell, or ovum (plural ova), is the female reproductive cell (gamete) in oogamous organisms.

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Embryo quality

Embryo quality is the ability of an embryo to perform successfully in terms of conferring a high pregnancy rate and/or resulting in a healthy person.

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Emotion recognition

Emotion recognition is the process of identifying human emotion, most typically from facial expressions as well as from verbal expressions.

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Empathy

Empathy is the capacity to understand or feel what another person is experiencing from within their frame of reference, i.e., the capacity to place oneself in another's position.

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Endocrine system

The endocrine system is a chemical messenger system consisting of hormones, the group of glands of an organism that carry those hormones directly into the circulatory system to be carried towards distant target organs, and the feedback loops of homeostasis that the hormones drive.

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Endometrium

The endometrium is the inner epithelial layer, along with its mucous membrane, of the mammalian uterus.

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Energy homeostasis

In biology, energy homeostasis, or the homeostatic control of energy balance, is a biological process that involves the coordinated homeostatic regulation of food intake (energy inflow) and energy expenditure (energy outflow).

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Enzyme

Enzymes are macromolecular biological catalysts.

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Epilepsy

Epilepsy is a group of neurological disorders characterized by epileptic seizures.

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Estradiol

Estradiol (E2), also spelled oestradiol, is an estrogen steroid hormone and the major female sex hormone.

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Estrogen

Estrogen, or oestrogen, is the primary female sex hormone.

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Estrogen receptor alpha

Estrogen receptor alpha (ERα), also known as NR3A1 (nuclear receptor subfamily 3, group A, member 1), is one of two main types of estrogen receptor, a nuclear receptor that is activated by the sex hormone estrogen.

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Estrogen receptor beta

Estrogen receptor beta (ER-β), also known as NR3A2 (nuclear receptor subfamily 3, group A, member 2), is one of two main types of estrogen receptor, a nuclear receptor which is activated by the sex hormone estrogen.

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Ethinylestradiol/etonogestrel

Ethinylestradiol/etonogestrel (brand names NuvaRing) is a contraceptive vaginal ring containing the estrogen ethinylestradiol and the progestin etonogestrel which is marketed in the United States and Europe.

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Etonogestrel birth control implant

Etonogestrel birth control implant, sold under the brand names Nexplanon among others, is a device made up of a single rod containing etonogestrel which is used for birth control.

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Extended cycle combined hormonal contraceptive

Extended or continuous cycle combined oral contraceptive pills are a packaging of combined oral contraceptive pills (COCPs) that reduce or eliminate the withdrawal bleeding that would occur once every 28 days in traditionally packaged COCPs.

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Fallopian tube

The Fallopian tubes, also known as uterine tubes or salpinges (singular salpinx), are two very fine tubes lined with ciliated epithelia, leading from the ovaries of female mammals into the uterus, via the uterotubal junction.

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Fat

Fat is one of the three main macronutrients, along with carbohydrate and protein.

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Fear processing in the brain

Many experiments have been done to find out how the brain interprets stimuli and how animals develop fear responses.

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Female reproductive system

The female reproductive system is made up of the internal and external sex organs that function in reproduction of new offspring.

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Fertility

Fertility is the natural capability to produce offspring.

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Fertility awareness

Fertility awareness (FA) refers to a set of practices used to determine the fertile and infertile phases of a woman's menstrual cycle.

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Fertility testing

Fertility testing is the process by which fertility is assessed, both generally and also to find the fertile window.

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Fimbriae of uterine tube

In the female reproductive system, the fimbria (plural, fimbriae) is a fringe of tissue around the ostium of the Fallopian tube, in the direction of the ovary.

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Follicle-stimulating hormone

Follicle-stimulating hormone (FSH) is a gonadotropin, a glycoprotein polypeptide hormone.

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Follicular phase

The follicular phase is the phase of the estrous cycle, (or, in humans and great apes, the menstrual cycle) during which follicles in the ovary mature.

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Folliculogenesis

In biology, folliculogenesis is the maturation of the ovarian follicle, a densely packed shell of somatic cells that contains an immature oocyte.

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GABAA receptor

The GABAA receptor (GABAAR) is an ionotropic receptor and ligand-gated ion channel.

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Gonadotropin

Gonadotropins are glycoprotein polypeptide hormones secreted by gonadotrope cells of the anterior pituitary of vertebrates.

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Gonadotropin-releasing hormone

Gonadotropin-releasing hormone (GnRH) also known as gonadoliberin, and by various other names in its endogenous form and as gonadorelin in its pharmaceutical form, is a releasing hormone responsible for the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary.

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Goodman & Gilman's The Pharmacological Basis of Therapeutics

Goodman & Gilman's The Pharmacological Basis of Therapeutics, commonly referred to as the Blue Bible or Goodman & Gilman, is a textbook of pharmacology originally authored by Louis S. Goodman and Alfred Gilman.

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Greek language

Greek (Modern Greek: ελληνικά, elliniká, "Greek", ελληνική γλώσσα, ellinikí glóssa, "Greek language") is an independent branch of the Indo-European family of languages, native to Greece and other parts of the Eastern Mediterranean and the Black Sea.

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Hormonal contraception

Hormonal contraception refers to birth control methods that act on the endocrine system.

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Hormonal IUDs

Intrauterine device (IUD) with progestogen, sold under the brand name Mirena among others, is a intrauterine device that releases the hormone levonorgestrel.

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Hormone

A hormone (from the Greek participle “ὁρμῶ”, "to set in motion, urge on") is any member of a class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behaviour.

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Human chorionic gonadotropin

Human chorionic gonadotropin (hCG) is a hormone produced by the placenta after implantation.

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Human embryogenesis

Human embryogenesis is the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development.

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Hypomenorrhea

Hypomenorrhea or hypomenorrhoea, also known as short or scanty periods, is extremely light menstrual blood flow.

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Hypothalamus

The hypothalamus(from Greek ὑπό, "under" and θάλαμος, thalamus) is a portion of the brain that contains a number of small nuclei with a variety of functions.

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Iceland

Iceland is a Nordic island country in the North Atlantic, with a population of and an area of, making it the most sparsely populated country in Europe.

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Immature ovum

An immature ovum is a cell that goes through the process of oogenesis to become an ovum.

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Implantation (human embryo)

In humans, implantation is the stage of pregnancy at which the already fertilized egg adheres to the wall of the uterus.

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In vitro fertilisation

In vitro fertilisation (IVF) is a process of fertilisation where an egg is combined with sperm outside the body, in vitro ("in glass").

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Inhibitory postsynaptic potential

An inhibitory postsynaptic potential (IPSP) is a kind of synaptic potential that makes a postsynaptic neuron less likely to generate an action potential.

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Iron deficiency

Iron deficiency, or sideropaenia, is the state in which a body has not enough (or not qualitatively enough) iron to supply its eventual needs.

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Irregular

Something that is irregular does not follow the expected pattern; not even or balanced in shape or arrangement; abnormal.

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Irregular menstruation

Irregular menstruation is a menstrual disorder whose manifestations include irregular cycle lengths as well as metrorrhagia (vaginal bleeding between expected periods).

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Joe Nickell

Joe Nickell (born December 1, 1944) is an American prominent skeptic and investigator of the paranormal.

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Latin

Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.

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Levonorgestrel-releasing implant

Levonorgestrel-releasing implant, sold under the brand name Jadelle among others, is a device made up of a two rods of levonorgestrel used for birth control.

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Lunar phase

The lunar phase or phase of the Moon is the shape of the directly sunlit portion of the Moon as viewed from Earth.

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Luteal phase

The luteal phase is the latter phase of the menstrual cycle (in humans and a few other animals) or the earlier phase of the estrous cycle (in other placental mammals).

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Luteinizing hormone

Luteinizing hormone (LH, also known as lutropin and sometimes lutrophin) is a hormone produced by gonadotropic cells in the anterior pituitary gland.

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Masculinity

Masculinity (manhood or manliness) is a set of attributes, behaviors, and roles associated with boys and men.

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Medroxyprogesterone acetate

Medroxyprogesterone acetate (MPA), sold under the brand name Depo-Provera among others, is a hormonal medication of the progestin type.

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Menarche

Menarche (Greek: μήν mēn "month" + ἀρχή arkhē "beginning") is the first menstrual cycle, or first menstrual bleeding, in female humans.

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Menometrorrhagia

Menometrorrhagia is a condition in which prolonged or excessive uterine bleeding occurs irregularly and more frequently than normal.

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Menopause

Menopause, also known as the climacteric, is the time in most women's lives when menstrual periods stop permanently, and they are no longer able to bear children.

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Menorrhagia

Menorrhagia is a menstrual period with excessively heavy flow and falls under the larger category of abnormal uterine bleeding (AUB).

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Menstrual disorder

A menstrual disorder is an abnormal condition in a woman's menstrual cycle.

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Menstrual leave

Menstrual leave is a type of leave where a woman may have the option to take paid or unpaid leave from her employment if she is menstruating and is unable to go to work because of this.

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Menstrual synchrony

Menstrual synchrony, also called the McClintock effect is an alleged process whereby women who begin living together in close proximity experience their menstrual cycle onsets (the onset of menstruation or menses) becoming more synchronized together in time than when previously living apart.

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Menstruation

Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue (known as menses) from the inner lining of the uterus through the vagina.

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Metrorrhagia

Metrorrhagia (metro.

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Migraine

A migraine is a primary headache disorder characterized by recurrent headaches that are moderate to severe.

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Mittelschmerz

Mittelschmerz (German: "middle pain") is a medical term for "ovulation pain" or "midcycle pain".

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Monkey

Monkeys are non-hominoid simians, generally possessing tails and consisting of about 260 known living species.

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Mood (psychology)

In psychology, a mood is an emotional state.

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Negative feedback

Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances.

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Nervous system

The nervous system is the part of an animal that coordinates its actions by transmitting signals to and from different parts of its body.

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Neurology

Neurology (from νεῦρον (neûron), "string, nerve" and the suffix -logia, "study of") is a branch of medicine dealing with disorders of the nervous system.

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Neuron

A neuron, also known as a neurone (British spelling) and nerve cell, is an electrically excitable cell that receives, processes, and transmits information through electrical and chemical signals.

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Neurotransmitter

Neurotransmitters are endogenous chemicals that enable neurotransmission.

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Nicotine

Nicotine is a potent parasympathomimetic stimulant and an alkaloid found in the nightshade family of plants.

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Norepinephrine

Norepinephrine (NE), also called noradrenaline (NA) or noradrenalin, is an organic chemical in the catecholamine family that functions in the brain and body as a hormone and neurotransmitter.

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Obstetrical bleeding

Obstetrical bleeding also known as obstetrical hemorrhage and maternal hemorrhage, refers to heavy bleeding during pregnancy, labor, or the postpartum period.

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Oligomenorrhea

Oligomenorrhea (or oligomenorrhoea) is infrequent (or, in occasional usage, very light) menstruation.

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Oocyte

An oocyte, oöcyte, ovocyte, or rarely ocyte, is a female gametocyte or germ cell involved in reproduction.

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Oral contraceptive pill

Oral contraceptives, abbreviated OCPs, also known as birth control pills, are medications taken by mouth for the purpose of birth control.

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Ovarian follicle

An ovarian follicle is a roughly spheroid cellular aggregation set found in the ovaries.

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Ovary

The ovary is an organ found in the female reproductive system that produces an ovum.

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Ovulation

Ovulation is the release of eggs from the ovaries.

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Ovulatory shift hypothesis

The ovulatory shift hypothesis is the theory that women experience evolutionarily adaptive changes in subconscious thoughts and behaviors related to mating across the ovulatory cycle.

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Paternal age effect

The paternal age effect is the statistical relationship between paternal age at conception and biological effects on the child.

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Pheromone

A pheromone (from Ancient Greek φέρω phero "to bear" and hormone, from Ancient Greek ὁρμή "impetus") is a secreted or excreted chemical factor that triggers a social response in members of the same species.

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Pituitary gland

An explanation of the development of the pituitary gland (Hypophysis cerebri) & the congenital anomalies. In vertebrate anatomy, the pituitary gland, or hypophysis, is an endocrine gland about the size of a pea and weighing in humans.

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Plasmin

Plasmin is an important enzyme present in blood that degrades many blood plasma proteins, including fibrin clots.

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Polycystic ovary syndrome

Polycystic ovary syndrome (PCOS) is a set of symptoms due to elevated androgens (male hormones) in females.

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Positive feedback

Positive feedback is a process that occurs in a feedback loop in which the effects of a small disturbance on a system include an increase in the magnitude of the perturbation.

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Pregnancy

Pregnancy, also known as gestation, is the time during which one or more offspring develops inside a woman.

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Pregnancy rate

Pregnancy rate is the success rate for getting pregnant.

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Pregnancy test

A pregnancy test attempts to determine whether or not a woman is pregnant.

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Premenstrual syndrome

Premenstrual syndrome (PMS) refers to physical and emotional symptoms that occur in the one to two weeks before a woman's period.

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Primate

A primate is a mammal of the order Primates (Latin: "prime, first rank").

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Progesterone

Progesterone (P4) is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species.

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Progestogen

Progestogens, also sometimes spelled progestagens or gestagens, are a class of steroid hormones that bind to and activate the progesterone receptor (PR).

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Progestogen-only pill

Progestogen-only pills or progestin-only pills (POP) are contraceptive pills that contain only synthetic progestogens (progestins) and do not contain estrogen.

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Prolactin

Prolactin (PRL), also known as luteotropic hormone or luteotropin, is a protein that is best known for its role in enabling mammals, usually females, to produce milk.

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Protein

Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.

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Serotonin

Serotonin or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter.

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Sex steroid

Sex steroids, also known as gonadocorticoids and gonadal steroids, are steroid hormones that interact with vertebrate androgen or estrogen receptors.

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Sexual intercourse

Sexual intercourse (or coitus or copulation) is principally the insertion and thrusting of the penis, usually when erect, into the vagina for sexual pleasure, reproduction, or both.

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Smooth muscle tissue

Smooth muscle is an involuntary non-striated muscle.

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Spermatozoon

A spermatozoon (pronounced, alternate spelling spermatozoön; plural spermatozoa; from σπέρμα "seed" and ζῷον "living being") is a motile sperm cell, or moving form of the haploid cell that is the male gamete.

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Standard deviation

In statistics, the standard deviation (SD, also represented by the Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values.

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Stress (biology)

Physiological or biological stress is an organism's response to a stressor such as an environmental condition.

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Subdermal implant

A subdermal implant refers to a body modification that is placed underneath the skin, therefore allowing the body to heal over the implant and creating a raised design.

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Suicide

Suicide is the act of intentionally causing one's own death.

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Syncytiotrophoblast

Syncytiotrophoblast (from the Greek 'syn'- "together"; 'cytio'- "of cells"; 'tropho'- "nutrition"; 'blast'- "bud") is the epithelial covering of the highly vascular embryonic placental villi, which invades the wall of the uterus to establish nutrient circulation between the embryo and the mother.

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Thyroid

The thyroid gland, or simply the thyroid, is an endocrine gland in the neck, consisting of two lobes connected by an isthmus.

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Tobacco

Tobacco is a product prepared from the leaves of the tobacco plant by curing them.

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Twin

Twins are two offspring produced by the same pregnancy.

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United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usage is mixed with some organisations, including the and preferring to use Britain as shorthand for Great Britain is a sovereign country in western Europe.

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United States

The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.

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Uterus

The uterus (from Latin "uterus", plural uteri) or womb is a major female hormone-responsive secondary sex organ of the reproductive system in humans and most other mammals.

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Vaginal bleeding

Vaginal bleeding is any bleeding through the vagina, including bleeding from the vaginal wall itself, as well as (and more commonly) bleeding from another location of the female reproductive system, often the uterus.

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Endometrial cycle, Eumenorrhea, Female cycle, Female menstruation cycle, Fertile window, Fertilization window, Menstration, Menstrual, Menstrual Cycle, Menstrual bleeding, Menstrual cycle length, Menstrual cycles, Menstrual period, Menstrual periods, Menstruating, Menstruation cycle, Menstruation-inducing agents, Menstruum, Menstural cycle, Mesntrual cycle, Monthly period, Nightlighting (menstrual cycle), On the rag, Ovarian cycle, Ovulation cycle, Panty pad, Patterns in the menstrual cycle, Period (feminine), Premenstruation, Secretory phase, Uterian Cycle, Uterine cycle.

References

[1] https://en.wikipedia.org/wiki/Menstrual_cycle

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