After ovulation, which structure forms to produce progesterone?

After ovulation, which structure forms to produce progesterone?

• A. Corpus luteum
• B. Corpus albicans
• C. Graafian follicle
• D. Primordial follicle

Answer: (A)

After ovulation, LH prompts the ruptured follicle to luteinize, forming the corpus luteum. This structure becomes the main source of progesterone (with some estrogen), which converts the endometrium into a secretory lining and helps maintain it for a possible implantation and early pregnancy. If no embryo implants, the corpus luteum degenerates into the corpus albicans, progesterone falls, and menstruation begins. If pregnancy occurs, hCG from the embryo keeps the corpus luteum active so it continues producing progesterone until the placenta can take over.

After ovulation, LH prompts the ruptured follicle to luteinize, forming the corpus luteum. This structure becomes the main source of progesterone (with some estrogen), which converts the endometrium into a secretory lining and helps maintain it for a possible implantation and early pregnancy. If no embryo implants, the corpus luteum degenerates into the corpus albicans, progesterone falls, and menstruation begins. If pregnancy occurs, hCG from the embryo keeps the corpus luteum active so it continues producing progesterone until the placenta can take over.