What effect does FSH (follicle stimulating hormone) have on the ovary?

Follicle-stimulating hormone (FSH) plays a crucial role in the regulation of the female reproductive system. In particular, one of its primary functions is to promote the growth and maturation of ovarian follicles. When FSH is released by the pituitary gland, it stimulates the granulosa cells in the developing follicles within the ovaries. This stimulation leads to the enlargement of the graafian follicle, which is the mature ovarian follicle that is ready to release an egg during ovulation.

This process is essential for normal ovarian function and fertility, as the enlargement of the graafian follicle indicates that it is preparing for ovulation. Therefore, the effect of FSH on the ovary is significant because it directly influences the development of eggs and the menstrual cycle.