What is the term for the phase where blood supply to the endometrium is blocked, leading to tissue necrosis?

What is the term for the phase where blood supply to the endometrium is blocked, leading to tissue necrosis?

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

Answer: (B)

The phase where blood supply to the endometrium is blocked, resulting in tissue necrosis, is known as the ischemic phase. This occurs at the end of the menstrual cycle, particularly if implantation of a fertilized egg does not take place. During this time, the levels of hormones such as estrogen and progesterone decline, leading to constriction of blood vessels that supply the endometrial tissue. As a result, the lack of blood flow causes the tissue to become deprived of oxygen and nutrients, ultimately leading to necrosis. The ischemic phase is a critical change that sets the stage for menstrual bleeding to begin, as the necrotic tissue detaches and is expelled from the body. Understanding this phase is essential in the study of the menstrual cycle and women's reproductive health.