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Which gonadal hormone holds down FSH secretion by the anterior pituitary?
ARelaxin
BInhibin
COxytocin
DEstradiol
Answer & Solution
Correct answer: B. Inhibin
1. Follicle-stimulating hormone drives sperm maturation in men and egg maturation in women.
2. The testes make inhibin, which inhibits secretion of follicle-stimulating hormone by the anterior pituitary.
3. The granulosa cells of ovarian follicles make inhibin as well, with the same effect.
4. Relaxin is a placental hormone that softens and widens the pubic symphysis before childbirth.
5. Oxytocin acts on uterus and milk ducts and has no role in suppressing this gonadotropin.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.8 Gonadal and Placental Hormones_
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