Which hormone is involved in signaling pregnancy and maintaining uterine conditions?

• A. Ovulin
• B. Luteinizing hormone
• C. Progesterone
• D. Androgen

Answer: (C)

Progesterone is the hormone primarily responsible for signaling pregnancy and maintaining the proper conditions in the uterus. After ovulation, the corpus luteum forms and secretes progesterone, which plays a crucial role in preparing the uterine lining for potential implantation of a fertilized egg. It helps to thicken the endometrium, ensuring that it is receptive to an embryo and supports early pregnancy.

Additionally, progesterone helps to inhibit uterine contractions, which is essential for protecting the developing fetus. If pregnancy occurs, progesterone levels remain elevated to support the pregnancy until the placenta takes over hormone production later on. This central role in sustaining the appropriate uterine environment highlights why progesterone is the correct answer in this context.