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What is correct to say about the hormone action in humans?

1. Glucagon is secreted by β-cells of islets of Langerhans and stimulates glycogenolysis.
2. Secretion of thymosins is stimulated with ageing.
3. In females FSH first binds with specific receptors on ovarian cell membrane.
4. FSH stimulates the secretion of estrogen and progesterone.

Correct answer: In females FSH first binds with specific receptors on ovarian cell membrane.

Solution

FSH acts by binding to specific receptors on the membrane of ovarian cells, especially granulosa cells, to promote follicular growth and estrogen production. The other options are incorrect because glucagon is secreted by α-cells, thymosin decreases with age, and FSH does not directly stimulate progesterone secretion.

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