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Definition: Menstruating |
MenstruatingAdjective1. Undergoing menstruation. Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. |
(From Wikipedia, the free Encyclopedia)
The menstrual cycle is the periodic change in a woman's body that occurs every month between puberty and menopause and is related to reproduction. The average menstrual cycle is 28 days long, but it can range from 21 to 35 days. It is controlled by hormones.
By convention, the onset of menstrual bleeding (menstruation or menses) marks the beginning of the cycle. Menstruation lasts for several days and is caused by the loss of the lining of the uterus. The uterus was ready to accept a fertilized ovum (egg), but none arrived, and so the lining (called endometrium) is expelled. Therefore, if menstrual bleeding occurs, a woman knows that she is not pregnant. During menstruation, women typically use tampons (plugs made from absorbent material and inserted into the vagina) or sanitary towels (worn outside the vagina) to prevent the soiling of clothes.
Then a new egg matures in the ovaries, and about at the middle of the cycle (14 days before beginning of the next menstrual bleeding), ovulation occurs, meaning that the egg is released by the ovary and enters the fallopian tube. In some women, ovulation is accompanied by a characteristic pain called Mittelschmerz which lasts for several hours. The egg (with a diameter of about 0.5 mm) then travels through the fallopian tube to the uterus, pushed along by movements of the lining of the tube. This trip takes about one day, and the egg is available to be fertilized during this period.
Sperm can live for up to 7 days inside a woman, so the second and the beginning of the third week of the cycle, before and shortly after ovulation, is the most fertile time with the highest likelihood of sexual intercourse leading to pregnancy. (It is important to note that pregnancy can occur from intercourse at any time during the menstrual cycle, even during menstruation.) Various natural family planning methods of birth control attempt to determine the precise time of ovulation in order to find the fertile and infertile days in the cycle.
In the meantime, the endometrium has started to grow again. If fertilization occurs, the egg implants in the wall of the uterus and major changes take place, with the menstrual cycle being suspended for the length of the pregnancy. If no fertilization occurs, the endometrium is lost with bleeding and the cycle starts again.
About 50 millilitres of blood are lost during menstruation. The blood is prevented from clotting by an enzyme called plasmin contained in the endometrium. In most women, menstruation is preceeded or accompanied by various unpleasant symptoms caused by the involved hormones and by cramping of the uterus. Among these are abdominal pain, migraine headache, depression and irritability.
The main hormones involved in control of the menstrual cycle are oestrogen and progesterone. At the beginning of the menstrual cycle, the pituitary gland releases Follicle Stimulating Hormone (FSH), signaling the immature follicles to grow in the ovaries. The follicle is a sac containing the egg. Oestrogen levels rise as the hormone is secreted by the developing follicles. During ovulation, the follicle and the ovary's wall burst, releasing the egg; oestrogen levels are maximal. After ovulation, both oestrogen and progesterone are secreted by the corpus luteum which developed from the burst follicle and remained in the ovary. Once the corpus luteum dies, hormone levels fall which causes the ejection of the endometrium with menstruation. These two hormones are also the main ingredients of most birth control pills.
All of a woman's eggs are present in the ovaries at the time of birth. An estimated 250,000 to 400,000 immature eggs exist in each ovary. Only a small fraction of them ever develop into mature eggs.
Even though there are two ovaries, normally only one egg will be produced per period. Which ovary "wins" is essentially random; there is no left/right coordination involved. As the level of the follicle stimulating hormone (FSH) increases, it stimulates the production of a follicle, the follicle secretes inhibin, which shuts off the FSH, preventing more follicles from developing. So each month, it depends on whether the left or right ovary is the lucky one to produce the first follicle.
The terms "menstruation" and "menses" come from the Latin mensis (month) from Greek mene (moon) in reference to the fact that the lunar month is also approximately 28 days long. There is no connection between lunar months and menstrual periods however, as is shown by the fact that the great apes have menstrual cycles that vary from 29 days in orangutans to 37 days in chimpanzees.
A regular menstrual cycle as described here only occurs in the higher primates. Females of other mammalian species go through certain episodes called "estrus" or "heat" in each breeding season. During these times, ovulation occurs and females are receptive to mating, a fact advertised to males in some way. If no fertilization takes place, the endometrium is reabsorbed by the uterus and no menstrual bleeding occurs.
See also:
- premenstrual stress syndrome (PMS or premenstrual syndrome)
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Menstrual cycle."
Synonym: MenstruatingSynonym: unwell (adj). (additional references) |
Crosswords: Menstruating |
| English words defined with "menstruating": flow ♦ menstruate, Menstruous ♦ toxic shock, toxic shock syndrome, TSS. (references) |
| Specialty definitions using "menstruating": rainbow kiss, red wing. (references) |
| Domain | Title |
Books | |
Source: compiled by the editor from various references; see credits. | |
| Subject | Topic | Quote |
Health | Menstruating women, women using barrier contraceptive devices, and persons who have undergone nasal surgery. (references) | |
Source: compiled by the editor from ICON Group International, Inc.; see credits. | ||
| "Menstruating" is generally used as a lexical verb (-ing form) -- approximately 83.33% of the time. "Menstruating" is used about 12 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted) |
| Parts of Speech | Percent | Usage per 100 Million Words | Rank in English |
| Lexical Verb (-ing form) | 83.33% | 10 | 111,207 |
| Adjective (general or positive) | 16.67% | 2 | 245,945 |
| Total | 100.00% | 12 | N/A |
Source: compiled by the editor from several corpora; see credits.
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Language | Translations for "menstruating"; alternative meanings/domain in parentheses. | |
Arabic | طامث (menstruous). (various references) | |
French | menstruation (menstruation). (various references) | |
German | menstruierend. (various references) | |
Pig Latin | enstruatingmay.(various references) | |
| Source: compiled by the editor from various translation references. | ||
Misspellings | |
"Menstruating" is suggested in spellcheckers for the following: denaturating. (additional references) | |
| Source: compiled by the editor, based on several corpora (additional references). | |
Scrabble® Enable2K-Verified Anagrams | |
| Words within the letters "a-e-g-i-m-n-n-r-s-t-t-u" | |
-1 letter: transmuting. | |
-2 letters: astringent, entrusting, instrument, numerating, nutriments, sauntering, smartening, smattering. | |
-3 letters: antiserum, argentums, arguments, emigrants, gannister, gauntries, geraniums, grantsmen, instanter, insurgent, intranets, mannerist, martinets, mastering, mattering, measuring, mustering, muttering, nattering, nutrients, nutriment, rattening, restating, retasting, ruminants, ruminates, saturnine, signature, streaming, stringent, strunting, surnaming, tautening, transient, transmute, truanting, umangites, unseaming, unseating, unsetting, unstating. | |
-4 letters: aginners. | |
| Words containing the letters "a-e-g-i-m-n-n-r-s-t-t-u" | |
+2 letters: argumentations. | |
+3 letters: underestimating. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
| 1. Definition 2. Synonyms 3. Crosswords 4. Usage: Commercial | 5. Quotations: Non-fiction 6. Usage Frequency 7. Expressions: Internet 8. Translations: Modern | 9. Derivations 10. Anagrams 11. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
