The Physiological Trigger for the Onset of Menstruation in Humans

question 29

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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