The secretion of Follicle Stimulating Hormone (FSH) happens in the pituitary gland, that simply functions for fertility of men and women. The pituitary gland is responsible for the production of this this hormone. The pituitary glands works through proteins and this is what it has to use in balancing hormones such as FSH, Gonadotropin which is also a partner of FSH.
Fertility is one of the problems of men and women. This is because there is a poor secretion of the FSH hormone. This is why the everything about the reproductive system is controlled by the pituitary glands secreting hormones that will help in the development of fertility. For example, menstrual period for women is the work of FHS.
The ovary of women should function well to produce eggs. If not, that is what we call ovarian deficincy. The level of FSH determines how fertile a woman is. In such case, women must be able to have the regular flow of menstruation and there should be a manifestation of growth and development during puberty period.
If not, then pituitary gland is does not function well. If then , there will be a deficiency in menstrual period that causes infertility.
Men needs the production of sperm through testes. If this fails, they will never be able to bear a child, same thorough with a woman when she is infertile. In fact, people should be able to bear a child. This is why, the normal functioning of the pituitary gland is very much necessary for all not only for the reproductive system but also for the endocrine system.