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Luteinizing hormone ( LH, also known as luteinising hormone, [1] lutropin and sometimes lutrophin [2]) is a hormone produced by gonadotropic cells in the anterior pituitary gland. The production of LH is regulated by gonadotropin-releasing hormone (GnRH) from the hypothalamus. [3] In females, an acute rise of LH known as an LH surge, triggers ...
Ovulation is the release of eggs from the ovaries. In women, this event occurs when the ovarian follicles rupture and release the secondary oocyte ovarian cells. [1] After ovulation, during the luteal phase, the egg will be available to be fertilized by sperm. In addition, the uterine lining ( endometrium) is thickened to be able to receive a ...
Ovulation occurs ~35 hours after the beginning of the LH surge or ~10 hours following the LH surge. Several days after ovulation, the increasing amount of estrogen produced by the corpus luteum may cause one or two days of fertile cervical mucus, lower basal body temperatures, or both. This is known as a "secondary estrogen surge".
About mid-cycle, some 10–12 hours after the increase in luteinizing hormone, known as the LH surge, the dominant follicle releases an oocyte, in an event called ovulation. After ovulation, the oocyte lives for 24 hours or less without fertilization, while the remains of the dominant follicle in the ovary become a corpus luteum – a body with ...
The LH surge then causes the release of the egg. Ovulation is triggered in induced ovulators by an LH surge from the anterior pituitary that is induced during mating. Animals this has been recorded in include rabbits, voles, ferrets and camels. In some species such as the ferret, the duration of intromission has no effect on the LH surge ...
The surge also initiates luteinization of thecal and granulosa cells. Ovulation normally occurs 30 (± 2) hours after the beginning of the LH surge (when LH is first detectable in urine). Follicular waves. Follicular waves are best described as the phase when follicles have matured sufficiently and rupture, leading to ovulation.
Ovulation occurs about 109 hours after the start of follicle growth. Estrogen peaks at about 11 am on the day of proestrus. Between then and midnight there is a surge in progesterone , luteinizing hormone and follicle-stimulating hormone , and ovulation occurs at about 4 am on the next estrus day.
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