HCG is secreted by which tissue?

HCG is secreted by which tissue?

• A. Trophoblastic tissue
• B. Endometrium
• C. Myometrium
• D. Decidua

Answer: (A)

Human chorionic gonadotropin (hCG) is produced by the trophoblastic tissue that forms the outer layer of the implanted embryo and later the placenta. The syncytiotrophoblast cells secrete hCG into the maternal blood early in pregnancy, which signals the corpus luteum to continue producing progesterone (and estrogen) to maintain the uterine lining until the placenta can take over hormone production. The other uterine tissues—endometrium, myometrium, and decidua—support the pregnancy but do not secrete hCG themselves.

Human chorionic gonadotropin (hCG) is produced by the trophoblastic tissue that forms the outer layer of the implanted embryo and later the placenta. The syncytiotrophoblast cells secrete hCG into the maternal blood early in pregnancy, which signals the corpus luteum to continue producing progesterone (and estrogen) to maintain the uterine lining until the placenta can take over hormone production. The other uterine tissues—endometrium, myometrium, and decidua—support the pregnancy but do not secrete hCG themselves.