NEET · BiologyHard
Which of the following hormonal profiles is characteristic of the immediate pre-ovulatory phase in a human female with a 28-day cycle?
- A.High levels of and a surge of
- B.High levels of and a surge of
- C.Low levels of and a surge of
- D.High levels of and a surge of
Show correct answer & step-by-step solution
Correct answer: A — High levels of and a surge of
Solution
- As the Graafian follicle matures, it secretes high levels of estrogen.
- High estrogen concentrations exert positive feedback on the hypothalamus and anterior pituitary.
- This triggers a massive release of , known as the surge.
- Hence the answer is (A).
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