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Answer: 1. estrogen and progesterone

Key idea: GnRH pulse frequency in females is controlled by the circulating levels of oestrogen and progesterone.

These ovarian steroids feed back to the hypothalamus; rising oestrogen increases the pulse rate before ovulation, while progesterone slows it in the luteal phase. Inhibin mainly acts on the pituitary to suppress FSH, hence the official key is (1).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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