Question

select the correct answer.
which process is responsible for causing menstruation?
a. breakdown of the corpus luteum
b. fertilization of the egg
c. implantation of the egg in the endometrium
d. rupture of a follicle in the ovary
e. repair of the endometrial lining

Explanation:

To determine the process causing menstruation, we analyze each option:

• Option A: The corpus luteum secretes progesterone to maintain the uterine lining. If fertilization doesn’t occur, the corpus luteum breaks down, leading to a drop in progesterone. This causes the uterine lining (endometrium) to shed, triggering menstruation.
• Option B: Fertilization (if it occurs) prevents menstruation, as the embryo implants and maintains hormone levels. Eliminate B.
• Option C: Implantation occurs during pregnancy, which stops menstruation. Eliminate C.
• Option D: Follicle rupture (ovulation) releases the egg but does not directly cause menstruation. Menstruation follows if fertilization fails after ovulation. Eliminate D.
• Option E: Repair of the endometrial lining happens after menstruation, not during. Eliminate E.

Answer:

A. breakdown of the corpus luteum