During the Menstrual Cycle, What is the Main Source of Progesterone

Question

During the menstrual cycle, what is the main source of progesterone in females?
A) placenta
B) pituitary gland
C) developing follicle
D) corpus luteum

Accepted Answer

During the menstrual cycle, the main source of progesterone in females is the corpus luteum, a temporary endocrine gland that develops from the ruptured ovarian follicle after ovulation. If the fertilization and implantation of the egg occur, the corpus luteum will be maintained by the hormone human chorionic gonadotropin (hCG) produced by the developing placenta. However, if fertilization does not occur, the corpus luteum will degenerate, leading to a drop in progesterone levels, and triggering menstruation.