This is the hormone secreted after ovulation by the corpus luteum. It is a steroid (a cholesterol with a funny hat), enters receptive cells to stimulate their growth, and acts as an anabolic agent. Estrogen should be viewed as the primary coat underneath all the cycles during a woman's reproductive years, with progesterone, its antagonist, surging for ten or twelve days in ovulatory months. Most of the actions of progesterone cannot occur without estrogen having previously induced the growth of progesterone-receptive binding sites. In the estrus cycle, estrogen stimulates the thickening of membranes (the proliferative phase), and progesterone stimulates their sophistication into organized and secreting mucosa (the secretory phase). The new secretions contain anticoagulants, antimicrobials, and rich mucus fluids. If there is pregnancy, the uterine membranes are fully structured for the long haul; if menses occurs, the thickened tissues can erode away without clotting, becoming infected, or flowing poorly. If there is not enough estrogen, the corpus luteum will not mature. If the corpus luteum is weak, menses becomes disorganized, clotty, and painful. It is also the first part of the cycle to become disorganized in early menopause, since the available ovarian proto-follicles have been reduced over the years to only a few. In earlier years, dozens of potential follicles may attempt maturity each month, with only the strongest one able to reach dominance, form a corpus luteum and an ovum...the rest disintegrating. In a manner of speaking, the better the follicle, the better the corpus luteum and (presumably) the sounder the ovum. Since the number of potential follicles is fixed at birth, by early menopause those that still remain contain a high number of hormone-resistant and unsound proto-follicles, resulting in more and more cycles having less predictable estrogen and especially progesterone levels.

Herbal-medical glossary. 2015.

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  • Progesterone — Progestérone Progestérone Formule chimique de la progestérone Général No CAS …   Wikipédia en Français

  • Progestérone — Formule chimique de la progestérone Général No CAS …   Wikipédia en Français

  • progestérone — [ prɔʒɛsterɔn ] n. f. • 1941; de pro , lat. gestare et (horm)one ♦ Biochim. Hormone sécrétée par le corps jaune (après l ovulation et pendant la grossesse), ainsi que par le placenta. ⇒vx lutéine. La progestérone prépare la muqueuse utérine à l… …   Encyclopédie Universelle

  • progesterone — progesterone. См. прогестерон. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • progesterone — /prodʒeste rone/ s.m. [comp. di proge(stina ) e ster(olo ), col suff. one2]. (fisiol.) [ormone sessuale femminile, prodotto soprattutto nell ovaio] ▶◀ luteina …   Enciclopedia Italiana

  • progesterone — female steroid sex hormone which prepares the uterus for child bearing, 1935, from Ger. Progesteron, coined by Corner and Allen, from progestin (1930, from which it was obtained), on notion of substance which favors gestation, from pro (see PRO… …   Etymology dictionary

  • progesterone — ► NOUN Biochemistry ▪ a steroid hormone released by the corpus luteum that stimulates the uterus to prepare for pregnancy …   English terms dictionary

  • progesterone — [prō jes′tər ōn΄] n. [ PRO 1 + GE(STATION) + STER(OL) + ONE] a steroid hormone, C21H30O2, secreted by the corpus luteum or prepared synthetically, active in preparing the uterus for the reception and development of the fertilized ovum and the… …   English World dictionary

  • progesterone — /proh jes teuh rohn /, n. 1. Biochem. a hormone, C21H30O2, that prepares the uterus for the fertilized ovum and maintains pregnancy. 2. Pharm. a commercial form of this compound, obtained from the corpus luteum of pregnant sows or synthesized:… …   Universalium

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