Which hormone is released by the corpus luteum and supports the endometrium for pregnancy?

Which hormone is released by the corpus luteum and supports the endometrium for pregnancy?

• A. Estrogen
• B. Progesterone
• C. Calcitonin
• D. Testosterone

Answer: (B)

Progesterone is released by the corpus luteum after ovulation and is the hormone that directly maintains and prepares the endometrium for implantation and early pregnancy. It converts the lining into a secretory state rich in nutrients, promotes gland development and vascularization, and helps keep the uterus relaxed to reduce contractions that might disrupt implantation. If pregnancy occurs, hCG from the embryo keeps the corpus luteum producing progesterone until the placenta can take over. Estrogen also supports the endometrium but its main role is earlier in the cycle and in synergy with progesterone, not the sole keeper of the endometrium for pregnancy. Calcitonin and testosterone don’t play this role.

Progesterone is released by the corpus luteum after ovulation and is the hormone that directly maintains and prepares the endometrium for implantation and early pregnancy. It converts the lining into a secretory state rich in nutrients, promotes gland development and vascularization, and helps keep the uterus relaxed to reduce contractions that might disrupt implantation. If pregnancy occurs, hCG from the embryo keeps the corpus luteum producing progesterone until the placenta can take over. Estrogen also supports the endometrium but its main role is earlier in the cycle and in synergy with progesterone, not the sole keeper of the endometrium for pregnancy. Calcitonin and testosterone don’t play this role.