At the start of each ovarian cycle, FSH and LH are released. These hormones stimulate the granulosa and thecal cells (respectively) of the follicle that surrounds the ovum. Consequently a few ovarian follicles are stimulated to mature. Which of the listed subsequent developments is an example of positive feedback?

The developing follicle produces estrogens at a low level which act on the anterior pituitary to inhibit the release of FSH and LH.

Granulosa cells secrete inhibin which inhibits the release of FSH.

Rapidly increasing plasma concentration of estrogens stimulates a surge in LH release which stimulates ovulation.

High plasma concentrations of progesterone and estrogen act on the hypothalamus to inhibit the release of GnRH.

Rapidly increasing plasma concentration of estrogens stimulates a surge in LH release which stimulates ovulation. The rapidly increasing production of estrogens by the developing follicle stimulates a surge in the release of LH by the anterior pituitary (rather than a decrease). In turn the follicle is stimulated to ovulate which means that the granulosa and thecal cells cease to secrete estrogens. Instead they become the corpus luteum and secrete progesterone.

Homeostasis Author: rikazzz