Menstruation is periodic uterine bleeding:
a. That occurs every 28 days.
b. In which the entire uterine lining is shed.
c. That is regulated by ovarian hormones.
d. That leads to fertilization.
ANS: C
Menstruation is periodic uterine bleeding that is controlled by a feedback system involving three cycles: endometrial, hypothalamic-pituitary, and ovarian. The average length of a menstrual cycle is 28 days, but variations are normal. During the endometrial cycle, the functional two thirds of the endometrium is shed. Lack of fertilization leads to menstruation.
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