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 these answers.

Question

Quizplus · Accepted Answer

During the menstrual phase, estrogen and progesterone levels are low, leading to the shedding of the uterine lining. The corpus luteum degenerates if pregnancy does not occur, and prostaglandins cause vasoconstriction, leading to menstruation. A new ovarian follicular phase also begins.

During the Menstrual Phase of the Uterine Cycle