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Ovarian Cycle03

Ovarian Cycle03 - • Basal temperature increases...

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The Ovarian Cycle Menstrual Cycle: monthly rhythm of endometrial buildup, breakdown, and discharge; averages 28 days long. Durations vary between individuals. Menstrual Phase Day 1-6 Menses: shedding of the endometrium due to drastic drops in progesterone levels Constriction of blood vessels (depriving the uterine lining of nutrients and oxygen) All hormonal levels are low, but by day three FHS and LH levels begin to rise Follicular (Proliferative) Phase Day 7-14 Uterus thickens, ovarian follicles develop Follicle Stimulating Hormone (FHS) and Luteinizing Hormone (LH)= ovarian activity and stimulation of ovulation Follicles release estrogen which thickens the endometrium, preparing the uterus for the arrival of an embryo Ovulation Day 14 One follicle becomes dominant; it bursts and releases the oocyte Dominant follicle becomes corpus luteum (CL)
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Unformatted text preview: • Basal temperature increases immediately after ovulation • Fertility is greatest five days before to 1-2 days after ovulation • Only one gamete produced each month (1 diploid sex cell produces 1 haploid) Luteal (Secretory) Phase • Day 14-28 • CL= temporary endocrine gland that arises from wall of dominant ovarian follicle • CL released progesterone and estradiol-17beta (an estrogen) • Neg. feedback on FSH and LH (which cause regression of CL) • Atrophy of CL ( if failed implantation) Conception and Implantation • Maintenance of CL= Human Chorionic Gonadotropin (hCG); unique to embyo (hormone that shows up in pregnancy tests) • CL= maintain placenta, inhibit ovulation, prepare body for pregnancy • Placenta takes over progesterone production at about week 3, atrophy of CL...
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Ovarian Cycle03 - • Basal temperature increases...

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