Which hormone is involved in developing the placenta?

• A. Estrogen
• B. Progesterone
• C. Oxytocin
• D. Luteinizing hormone

Answer: (B)

Progesterone plays a critical role in the development of the placenta during pregnancy. It is produced primarily by the corpus luteum in the early stages of pregnancy and later by the placenta itself. This hormone helps maintain the uterine lining, ensuring the environment is suitable for the implantation and nourishment of the developing embryo. Additionally, progesterone supports the growth of blood vessels and other tissues necessary for placental function, enabling it to adequately support the fetus by facilitating nutrient and waste exchange.

Estrogen also contributes to pregnancy and placental development but primarily works in conjunction with progesterone, enhancing uterine blood flow and promoting further growth of the placenta. However, the specific initiation and sustenance of the placental development process are more directly linked to progesterone. Oxytocin is primarily involved in labor and milk ejection rather than placental development, while luteinizing hormone plays a role in regulating the menstrual cycle and ovulation but does not directly influence the formation of the placenta.