Potražite članak.... Više rezultata... ODLIČAN VIDEO : OVULACIJA VideoŽelim bebu Postavio Sonja Milekic Datum мај 28, 2016 Image: 0042310794, License: Rights managed, The menstrual cycle with periods of fecundity. From the top to the bottom : ovarian cycle, hormonal cycle and curve of temperature. The menstrual cycle is divided into three phases : the follicular phase (or proliferative), pre-ovulatory, the luteal phase (or secretory), post-ovulatory and menstruation (menses). The follicular phase : Inside the ovary, the ovarian follicles, carrying the ovocytes, develop (primordial follicle, primary, secondary and tertiary). At the same time, the hypothalamic hormone GnRH provokes the cyclic secretion of two hypophyseal hormones, the gonadotrophins LH (luteinizing hormone) and FSH (follicle-stimulating hormone). The FSH (in green) enables the evolution of the ovarian follicles and assures the maturation of a Graafian follicule by cycle. This follicle secretes estrogens, of which the rate will then progressively increase. On the fourteenth day of the cycle, the simultaneous release of a strong dose of FSH and LH (in light blue) into the blood trigger ovulation : a mature tertiary follicle (or Graafian follicle) ejects the ovocyte II it contains : it is ovulation. At the level of the uterus, the endometrium is preparing to receive a possible embryo : it thickens and the uterine glands develop. The body temperature is stable (between 36.5 and 37°C in general). The luteal phase : Dans l'ovaire, under the action of LH, the Graafian follicle emptyied of its content, or dehiscent follicle, degenerates into corpus luteum ; it is follicular atresia. The combined action of LH and FSH is responsible for the secretion of estrogen and progesterone by the corpus luteum. The endometrium pursues its maturation, and the uterine glands secrete glycogen for the possible nutrition of the futur embryo. The progesterone acts indirectly on the centers of the hypothalamus thermic regulation, causing an increase of a few dozen of degrees of the body temperature. This elevation pursues during 12 to 14 days, it is the thermal plate. Within the uterus, the endometrium pursues its maturation, and the uterine glands secrete glycogen for the possible nutrition of the futur embryo. The menstruation : In absence of fertilization, the corpus luteum disappear. The estrogen and progesterone assure the maintain of the uterine mucous membrane, the drop in their blood rates trigger menstruation. The fecundability : The fertility of a woman is maximal in the period surrounding the ovulation. The spermatozoon having a duration of life of more than five days and the ovum of two, the fertile period starts six days before and ends two or three days after the ovulation. This period can be determined by establishing the curve of temperature of the individual : the increase of temperature indicates ovulation (it starts the day or the day after the ovulation)., Property Release: No or not aplicable, Model Release: No or not aplicable, Credit line: Profimedia.com, BSIP 0 Share FacebookTwitterTelegramLinkedinWhatsAppViber Pogledajte video Lekar info. Jako lepo objašnjeno . PODELITE I SA DRUGIMA :* HVALA Featured 0 Share FacebookTwitterTelegramLinkedinWhatsAppViber