The Luteal Phase of the Ovarian Cycle

Question

The luteal phase of the ovarian cycle
A) is responsible for menstruation.
B) is responsible for the uterine secretory phase.
C) elevates plasma levels of estrogen, progesterone, and hCG.
D) precedes the LH surge.

Accepted Answer

The luteal phase of the ovarian cycle is responsible for the uterine secretory phase, during which the endometrial lining of the uterus thickens in preparation for implantation. It is characterized by the presence of the corpus luteum, which secretes progesterone and a small amount of estrogen. The luteal phase follows ovulation and precedes menstruation, and typically lasts 10-14 days. Plasma levels of estrogen and progesterone increase during this phase, but hCG is not typically present unless fertilization and implantation have occurred.