How is a new menstrual cycle initiated when fertilization fails to occur?

0 votes

 

Progesterone levels drop due to degeneration of the corpus luteum, releasing the hypothalamus and pituitary from feedback inhibition. FSH levels rise.

hCG produced by the uterine lining signals the corpus luteum to degenerate, releasing the hypothalamus and pituitary from feedback inhibition. FSH levels rise.

hCG, produced by the embryo after implantation in the uterus, signals the corpus luteum to degenerate. Progesterone levels drop and FSH levels rise.

The nervous system detects the absence of implantation, signaling the release of GnRH from the hypothalamus, which triggers the release of FSH from the pituitary.

 

asked Jan 1, 2013 in Biology by anonymous
    

1 Answer

0 votes

 

Progesterone levels drop due to degeneration of the corpus luteum, releasing the hypothalamus and pituitary from feedback inhibition. FSH levels rise.

 

answered Jan 1, 2013 by anonymous



...