Which of the following is true during the 12-hour period preceding ovulation?

A. A surge of LH is secreted from the pituitary

B. The surge occurs immediately after the formation of the corpus luteum

C. The surge is followed immediately by a fall in the plasma concentration of progesterone

D. The number of developing follicles is increasing

Correct Answer: A surge of LH is secreted from the pituitary

Description: Ovulation will not take place unless a surge of LH precedes it. Immediately prior to ovulation, the number of follicles is decreasing due to normal attrition of all but one follicle, and consequently estrogen synthesis by the ovary is decreasing. Progesterone synthesis is stimulated by the LH surge.

Category: Physiology

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