Which of the following phases begins after ovulation?

• A. Follicular Phase
• B. Luteal Phase
• C. Menstrual Phase
• D. Ischemic Phase

Answer: (B)

The luteal phase begins after ovulation and is characterized by significant physiological changes driven by the hormone progesterone, which is produced by the corpus luteum. Following ovulation, the ruptured follicle transforms into the corpus luteum, which releases progesterone to prepare the uterine lining for a potential implantation of a fertilized egg. During this phase, if pregnancy does not occur, the corpus luteum degenerates, leading to decreased progesterone levels and ultimately triggering the menstrual phase.

The follicular phase, on the other hand, occurs before ovulation when follicles develop in the ovaries in response to follicle-stimulating hormone (FSH). The menstrual phase involves the shedding of the uterine lining and occurs after the luteal phase when pregnancy has not taken place. The ischemic phase is a part of the menstrual cycle that occurs just before menstruation, characterized by reduced blood supply to the endometrium.

Therefore, understanding the functions and hormone regulation during the luteal phase is crucial in women's health care, particularly in the contexts of fertility, menstrual health, and hormone-related disorders.