Question

The direct function of GnRH is to
A. Stimulate the production of estrogen and progesterone
B. Initiate ovulation
C. Inhibit secretion of pituitary hormones
D. Stimulates secretion of LH and FSH

Answer 1

Luteinizing hormone (LH) and follicle - stimulating hormone (FSH) are called gonadotropins because of being stimulated by the gonads - in males, the testes, and in females, the ovaries. For life, they are not necessary but are essential for reproduction.

Complete step by step answer:
Let's discuss the option and find the correct answer.
- Stimulate the production of estrogen and progesterone: To the hypothalamic GnRH neurons kisspeptin signals directly via the kisspeptin receptor to release GnRH into the portal circulation, which to produce LH and FSH, in turn, stimulates the anterior pituitary gonadotrophs.
- Initiate ovulation: These two hormones are secreted from cells in the anterior pituitary called gonadotrophs. Some gonadotrophs appear to secrete both hormones since most of the gonadotrophs secrete only LH or FSH. Hence, this option is incorrect.
- Inhibit secretion of pituitary hormones: These two hormones are secreted from cells in the anterior pituitary called gonadotrophs. Some gonadotrophs appear to secrete both hormones since most of the gonadotrophs secrete only LH or FSH. Hence, this option is incorrect.
- Stimulates secretion of LH and FSH: These two hormones are secreted from cells in the anterior pituitary called gonadotrophs. Some gonadotrophs appear to secrete both hormones since most of the gonadotrophs secrete only LH or FSH. Hence, this option is correct.
Hence, option D: Stimulates the secretion of LH, and FSH is the correct answer.

Note: These two hormones are secreted from cells in the anterior pituitary called gonadotrophs. Some gonadotrophs appear to secrete both hormones since most of the gonadotrophs secrete only LH or FSH.