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GnRH, a hypothalamic hormone, needed in reproduction, acts on:

1. (a) anterior pituitary gland and stimulates secretion of LH and FSH.
2. (b) posterior pituitary gland and stimulates secretion of oxytocin and FSH.
3. (c) posterior pituitary gland and stimulates secretion of LH and relaxin.
4. (d) anterior pituitary gland and stimulates secretion of LH and oxytocin.

Correct answer: (a) anterior pituitary gland and stimulates secretion of LH and FSH.

Solution

GnRH is a hypothalamic releasing hormone that travels to the anterior pituitary and stimulates gonadotrophs to release LH and FSH. The posterior pituitary mainly releases oxytocin and ADH, so it is not the target here.

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