Which of the following normally occurs during the proliferative phase of the menstrual cycle?
a. The cervical mucus thickens.
b. The endometrium degenerates and sheds.
c. Estrogen causes the endometrium to regenerate.
d. Menstrual flow consisting of blood and mucus occurs.
C
During the proliferative phase of the menstrual cycle, the endometrial lining begins to regenerate under the influence of estrogen. Changes in the cervical mucosa also occur during this phase. The cervical mucus becomes clearer, thinner, and threadlike. Cervical mucus does not thicken. Endometrium degeneration occurs as levels of progesterone and estrogen decrease at the commencement of the menstrual cycle. Menstrual flow occurs prior to the proliferative phase.
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