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The Physiological Trigger for the Onset of Menstruation in Humans

Question 34

Multiple Choice

The physiological trigger for the onset of menstruation in humans is caused by


A) ovulation.
B) an increase in estrogen.
C) the secretion of progesterone by the corpus luteum.
D) degeneration of the corpus luteum, resulting in a lack of progesterone for the support of the endometrium.

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