Question #9e9cb
1 Answer
See below...
Explanation:
At the start of the cycle, the Pituitary gland produces FSH (Follicle Stimulating Hormone). This stimulates the follicles in the ovaries to mature.
It also stimulates the ovaries to produce Estron, a Steroid Hormone that causes the endometrium (uterine lining) of the uterus to build up in preparation to receive an embryo if fertilisation takes place. It is often (wrongly) called Estrogen. Wrongly, as Estrogen means "Estron-like". Estrogens are a class of steroids that are derived from Estron, e.g. Estradiol.
Estron puts the brakes on FSH-production by the Pituitary gland, but at the same time induces it to produce LH (Luteinising Hormone), which causes ovulation and the development of the corpus luteum.
This in turn stops the ovaries producing Estron, but induces the follicle to produce Progesteron, which will cause development of the endometrium and keep the uterine lining from sloughing off for about 10 days if there is no fertilisation. If fertilisation does occur, and an embryo is implanted in the endometrium, the corpus luteum will continue to produce progesteron until the fetus produces its own progesteron.
Same as for Estrogens: Progestagens are (steroid) hormones derived from Progesteron....
BTW, the name Progesteron is derived from the Latin "Pro Gestatio", which means "for pregnancy"......
If fertilisation doesn't take place, the whole cycle starts again with FSH...
