When estrogen and progesterone levels drop, the endometrium enters the _____ phase
a. proliferative
b. luteal
c. menstrual
d. recovery
ANS: C
Without progesterone or estrogen to maintain it, the endometrium enters the ischemic (blood-starved) phase and disintegrates; this is referred to as the ischemic or menstrual phase. Drops in estrogen and progesterone levels are not associated with the proliferative, luteral, or re-covery phases of the menstrual cycle.
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