During the secretory phase of the menstrual cycle ________.

A) estrogen reaches its highest levels B) the Graafian follicle forms

C) LH reaches its highest levels D) progesterone levels are at their highest

13)

14) Normally menstruation occurs when ________.

A) the corpus luteum secretes estrogen

B) blood levels of estrogen and progesterone increase

C) blood levels of estrogen and progesterone decrease

D) blood levels of FSH fall off

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