During the Menstrual Phase

Question

During the menstrual phase,
A) progesterone levels are high.
B) a new uterine lining is formed.
C) secretory glands and blood vessels develop in the endometrium.
D) the old functional layer is sloughed off.
E) the corpus luteum is most active.

Accepted Answer

During the menstrual phase, the old functional layer of the endometrium is shed off, leading to the monthly bleeding. Progesterone levels are low during this phase. A new uterine lining is not formed until the proliferative phase, and secretory glands and blood vessels do not fully develop until the secretory phase. The corpus luteum is not active during the menstrual phase.