How does progesterone affect the menstrual cycle?

• A. It inhibits ovulation.
• B. It regulates body temperature.
• C. It prepares the endometrium for potential pregnancy.
• D. It promotes menstruation.

Answer: (C)

Progesterone plays a crucial role in the menstrual cycle, particularly during the luteal phase that follows ovulation. After an ovary releases an egg, the ruptured follicle transforms into the corpus luteum, which secretes progesterone. This hormone is essential for preparing the endometrium, which is the inner lining of the uterus, for a potential pregnancy.

Progesterone makes the endometrium thicker and more vascular, providing a nutrient-rich environment for a fertilized egg to implant and grow. If pregnancy occurs, progesterone helps maintain the uterine lining during the early stages of pregnancy. If there’s no fertilization, progesterone levels drop, leading to the breakdown of the uterine lining and the onset of menstruation.

Thus, the statement that progesterone prepares the endometrium for potential pregnancy is correct and encapsulates one of the key functions of this hormone in the menstrual cycle.