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The ovarian cycle describes changes that occur in the follicles of the ovary whereas the uterine cycle describes changes in the endometrial lining of the uterus.

Both cycles can be divided into three phases. The ovarian cycle consists of the follicular phase, ovulation, and the luteal phase, whereas the uterine cycle consists of menstruation, proliferative phase, and secretory phase.

The follicular phase is the first part of the ovarian cycle. During this phase, the ovarian follicles mature and get ready to release an egg.

Through the influence of a rise in follicle stimulating hormone FSH during the first days of the cycle, a few ovarian follicles are stimulated.

Under the influence of several hormones, all but one of these follicles will stop growing, while one dominant follicle in the ovary will continue to maturity.

The follicle that reaches maturity is called a tertiary or Graafian follicle, and it contains the ovum.

Ovulation is the second phase of the ovarian cycle in which a mature egg is released from the ovarian follicles into the oviduct.

When the egg has nearly matured, levels of estradiol reach a threshold above which this effect is reversed and estrogen stimulates the production of a large amount of LH.

The exact mechanism of these opposite responses of LH levels to estradiol is not well understood. The release of LH matures the egg and weakens the wall of the follicle in the ovary, causing the fully developed follicle to release its secondary oocyte.

If it is not fertilized by a sperm, the secondary oocyte will degenerate. The mature ovum has a diameter of about 0. Which of the two ovaries—left or right—ovulates appears essentially random; no known left and right co-ordination exists.

After being released from the ovary, the egg is swept into the fallopian tube by the fimbria , which is a fringe of tissue at the end of each fallopian tube.

After about a day, an unfertilized egg will disintegrate or dissolve in the fallopian tube. Fertilization by a spermatozoon , when it occurs, usually takes place in the ampulla , the widest section of the fallopian tubes.

A fertilized egg immediately begins the process of embryogenesis , or development. The developing embryo takes about three days to reach the uterus and another three days to implant into the endometrium.

In some women, ovulation features a characteristic pain called mittelschmerz German term meaning middle pain.

The luteal phase is the final phase of the ovarian cycle and it corresponds to the secretory phase of the uterine cycle.

During the luteal phase, the pituitary hormones FSH and LH cause the remaining parts of the dominant follicle to transform into the corpus luteum, which produces progesterone.

The increased progesterone in the adrenals starts to induce the production of estrogen. The hormones produced by the corpus luteum also suppress production of the FSH and LH that the corpus luteum needs to maintain itself.

Consequently, the level of FSH and LH fall quickly over time, and the corpus luteum subsequently atrophies. From the time of ovulation until progesterone withdrawal has caused menstruation to begin, the process typically takes about two weeks, with 14 days considered normal.

For an individual woman, the follicular phase often varies in length from cycle to cycle; by contrast, the length of her luteal phase will be fairly consistent from cycle to cycle.

The loss of the corpus luteum is prevented by fertilization of the egg. The syncytiotrophoblast , which is the outer layer of the resulting embryo-containing structure the blastocyst and later also becomes the outer layer of the placenta, produces human chorionic gonadotropin hCG , which is very similar to LH and which preserves the corpus luteum.

The corpus luteum can then continue to secrete progesterone to maintain the new pregnancy. Most pregnancy tests look for the presence of hCG.

The uterine cycle has three phases: menses, proliferative, secretory. Menstruation also called menstrual bleeding, menses, catamenia or a period is the first phase of the uterine cycle.

The flow of menses normally serves as a sign that a woman has not become pregnant. However, this cannot be taken as certainty, as a number of factors can cause bleeding during pregnancy ; some factors are specific to early pregnancy , and some can cause heavy flow.

Eumenorrhea denotes normal, regular menstruation that lasts for a few days usually 3 to 5 days, but anywhere from 2 to 7 days is considered normal.

Painful cramping in the abdomen, back, or upper thighs is common during the first few days of menstruation. Severe uterine pain during menstruation is known as dysmenorrhea , and it is most common among adolescents and younger women affecting about The proliferative phase is the second phase of the uterine cycle when estrogen causes the lining of the uterus to grow, or proliferate, during this time.

The estrogens initiate the formation of a new layer of endometrium in the uterus, histologically identified as the proliferative endometrium. The estrogen also stimulates crypts in the cervix to produce cervical mucus, which causes vaginal discharge regardless of arousal, and can be tracked by women practicing fertility awareness.

The secretory phase is the final phase of the uterine cycle and it corresponds to the luteal phase of the ovarian cycle.

During the secretory phase, the corpus luteum produces progesterone, which plays a vital role in making the endometrium receptive to implantation of the blastocyst and supportive of the early pregnancy, by increasing blood flow and uterine secretions and reducing the contractility of the smooth muscle in the uterus; [] it also has the side effect of raising the woman's basal body temperature.

While some forms of birth control do not affect the menstrual cycle, hormonal contraceptives work by disrupting it. Progestogen negative feedback decreases the pulse frequency of gonadotropin-releasing hormone GnRH release by the hypothalamus , which decreases the release of follicle-stimulating hormone FSH and luteinizing hormone LH by the anterior pituitary.

Decreased levels of FSH inhibit follicular development, preventing an increase in estradiol levels. Progestogen negative feedback and the lack of estrogen positive feedback on LH release prevent a mid-cycle LH surge.

Inhibition of follicular development and the absence of a LH surge prevent ovulation. The degree of ovulation suppression in progestogen-only contraceptives depends on the progestogen activity and dose.

The same cervical mucus changes occur as with very low-dose progestogens. High-dose, progestogen-only contraceptives—the injectables Depo-Provera and Noristerat—completely inhibit follicular development and ovulation.

Combined hormonal contraceptives include both an estrogen and a progestogen. Estrogen negative feedback on the anterior pituitary greatly decreases the release of FSH, which makes combined hormonal contraceptives more effective at inhibiting follicular development and preventing ovulation.

Estrogen also reduces the incidence of irregular breakthrough bleeding. In a normal cycle, menstruation occurs when estrogen and progesterone levels drop rapidly.

If withdrawal bleeding is not desired, combined hormonal contraceptives may be taken continuously , although this increases the risk of breakthrough bleeding.

Breastfeeding causes negative feedback to occur on pulse secretion of gonadotropin-releasing hormone GnRH and luteinizing hormone LH.

Depending on the strength of the negative feedback, breastfeeding women may experience complete suppression of follicular development, but no ovulation, or normal menstrual cycle may resume.

There is a wide range of response among individual breastfeeding women, however, with some experiencing return of menstruation at two months and others remaining amenorrheic for up to 42 months postpartum.

Menstruation can be delayed by the use of progesterone or progestins. For this purpose, oral administration of progesterone or progestin during cycle day 20 has been found to effectively delay menstruation for at least 20 days, with menstruation starting after 2—3 days have passed since discontinuing the regimen.

Several menstrual hygiene products exist for menstrual management. They are commonly used in the West, but are less available in some underdeveloped parts of the world.

Such products include sanitary napkins and tampons which are disposable ; cloth menstrual pad and menstrual cups which are reusable. Various improvised products may also be used, especially in the developing world, such as cotton, cloth, toilet paper.

In recent years, the problem of inaccessibility to these products has come to light and has become a center of debate in regards to abolishing the excess tax on them or making them completely free.

In some cultures, females are isolated during menstruation, as they are seen as unclean, dangerous, or bringing bad luck to those who encounter them.

These practices are common in parts of South Asia, especially in Nepal. Chhaupadi is a social practice that occurs in the western part of Nepal for Hindu women, which prohibits a woman from participating in everyday activities during menstruation.

Women are considered impure during this time, and are kept out of the house and have to live in a shed. Although chhaupadi was outlawed by the Supreme Court of Nepal in , the tradition is slow to change.

The practice has recently come under fire due to related fatalities. The word "menstruation" is etymologically related to "moon".

The terms "menstruation" and "menses" are derived from the Latin mensis month , which in turn relates to the Greek mene moon and to the roots of the English words month and moon.

Even though the average length of the human menstrual cycle is similar to that of the lunar cycle , in modern humans there is no relation between the two.

Dogon villagers did not have electric lighting and spent most nights outdoors, talking and sleeping, so they were apparently an ideal population for detecting a lunar influence; none was found.

In a number of countries, mainly in Asia, legislation or corporate practice has introduced formal menstrual leave to provide women with either paid or unpaid leave of absence from their employment while they are menstruating.

There are a growing number of activists who are working to fight for menstrual equity. At years-old, Nadya Okamoto , now a student at Harvard College, founded the organization, PERIOD, and wrote the book Period Power: a Manifesto for the Menstrual Movement.

Media related to Menstrual cycle at Wikimedia Commons. From Wikipedia, the free encyclopedia. Redirected from Menstrual Cycle. A type of ovulation cycle where the endometrium is shed if pregnancy does not occur.

Further information: Fertility testing. Further information: Dysmenorrhea. Main article: Menstrual disorder. Main article: Follicular phase. Main article: Ovulation.

Main article: Luteal phase. Main article: Menstruation. Main article: Hormonal contraception. Main article: Lactational amenorrhea method.

See also: Culture and menstruation. Further information: Chhaupadi and Seclusion of girls at puberty. See also: Lunar effect.

Glenview, IL: Pearson Education. Belmont, California: Cengage. Office of Women's Health, USA. More Definitions for period.

Kids Definition of period. Choose the Right Synonym for period period and age mean a portion of time.

More from Merriam-Webster on period Thesaurus: All synonyms and antonyms for period Nglish: Translation of period for Spanish Speakers Britannica English: Translation of period for Arabic Speakers Britannica.

Comments on period What made you want to look up period? WORD OF THE DAY. Get Word of the Day daily email! Test Your Vocabulary. Chinese checkers pente reversi go.

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A period happens because of changes in hormones in the body. Hormones are chemical messengers. The ovaries release the female hormones estrogen and progesterone.

These hormones cause the lining of the uterus or womb to build up. The built-up lining is ready for a fertilized egg to attach to and start developing.

If there is no fertilized egg, the lining breaks down and bleeds. Then the same process happens all over again.

It usually takes about a month for the lining to build up, then break down. That is why most girls and women get their periods around once a month.

The same hormones that cause the uterus lining to build up also cause an egg to leave one of the ovaries. The egg travels through a thin tube called a fallopian tube to the uterus.

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May Learn how and when to remove this template message. Main article: History by period. Further information: List of archaeological periods.

Further information: Universal history. Further information: History of the Americas and History of the United States. Further information: History of Southeast Asia.

Further information: History of the Philippines. Further information: History of China. Further information: History of Mongolia. Further information: History of Egypt.

Further information: History of Europe.

A period is a release of blood from a girl's uterus, out through her tack-n-stuff.com is a sign that she is getting close to the end of puberty.. There is a lot to learn about . Szukasz dobrego lekarza ze specjalizacji Periodontolog z miasta Warszawa? Sprawdź listę 34 polecanych lekarzy z tej kategorii - umów wizytę online! k Followers, Following, Posts - See Instagram photos and videos from CHRISS, PERIOD. (@chrissperiod).
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You also have the option to opt-out of these cookies. 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. Period definition is - the completion of a cycle, a series of events, or a single action: conclusion. How to use period in a sentence. Synonym Discussion of period. January 04, - GMT Emmy Griffiths Do you need something else to watch after storming through Bridgerton? Check out our favourite, slightly risque period dramas to sink your teeth into. period The period (also known as a full stop, especially in British English) is a punctuation mark .) primarily used to indicate the end of a sentence. It appears as a. The menstrual cycle is the regular natural change that occurs in the female reproductive system (specifically the uterus and ovaries) that makes pregnancy possible. The cycle is required for the production of oocytes, and for the preparation of the uterus for pregnancy.

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Johanna Stachel, Prof. Help Learn to edit Community portal Recent changes Upload file. It is unusual for a woman to experience cycle Sex In Lingen variations of more than four days. The increased progesterone in the adrenals starts to induce the production of estrogen. Statistics for period Last Updated 28 Dec Look-up Popularity. First, younger women are likely to experience menstrual irregularities due to their diet. During the part S&period the mouse estrous cycle when progesterone is Lesbian Kissing Sex, the level of nerve-cell GABA receptor subtype delta was high. Every girl's body has its own schedule. Through the influence of a rise in german girls ready for gangbang stimulating hormone FSH during the first days of the cycle, a few ovarian follicles are stimulated. Menstruation Follicular phase Ovulation Luteal phase. Novartis Foundation Symposium. Anovulatory bleeding triggered by a sudden drop in estrogen levels is called withdrawal bleeding. The average menstrual cycle Deutsche Milf Arsch 28 days. Chinese checkers pente reversi go. Preferences for facial features in mates can also change across the cycle. Punkt sofort aufgefallen wäre und sich inzwischen mit der Veröffentlichung völlig lächerlich gemacht. Login to He comes in a young tight pussy Tube Username. Photovoltaikforum Forum Sonstiges Off-Topic. Close Privacy Overview This website uses cookies Latex Bordell improve your experience while you navigate through the website.

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