During the menstrual phase of the uterine cycle,
A)a new ovarian follicular phase is beginning
B)estrogen and progesterone levels reach their lowest concentration
C)vasoconstriction of the uterine vessels occurs in response to release of a uterine prostaglandin
D)the corpus luteum degenerates
E)all of the above occur

Question

Quizplus · Accepted Answer

During the menstrual phase, estrogen and progesterone levels are low, leading to the shedding of the uterine lining. This phase coincides with the beginning of a new ovarian follicular phase. Prostaglandins cause vasoconstriction, leading to the shedding of the endometrium, and the corpus luteum degenerates if pregnancy does not occur.

During the Menstrual Phase of the Uterine Cycle