Can anyone explain the menstruation cycle?
The menstrual cycle 1) FSH (follicle-stimulating hormone) level secreted by the pituitary gland rises and stimulates follicle development and estrogen secretion. (A follicle is a fluid filled sac within the ovary containing a developing egg) 2) Estrogen makes the follicle cells produce more FSH receptors, and so respond more strongly to FSH. 3) FSH causes estrogen levels to rise and stimulate the repair of the uterus lining. 4) Peak levels of estrogen stimulate LH (lutenizing hormone) secretion by the pituitary gland. Peak levels of LH causes ovulation. 5) LH causes the follicle cells to secret less estrogen and more progesterone. After ovulation, LH causes the follicle to develop into something called a corpus luteum. 6) The corpus luteum secretes large amounts of progesterone, causing the uterus lining to prepare for an embryo. 7) High progesterone and estrogen levels inhibit FSH and LH secretion. 8) High progesterone and estrogen levels fall if no embryo has been formed, and menstru
