Question

What is the menstrual phase of the uterine cycle?

1) Menstruation
2) Proliferative phase
3) Secretory phase
4) Ischemic phase

Answer 1

The menstrual phase of the uterine cycle is menstruation, which involves the shedding of the endometrium and usually occurs from day 1 to 7 of the cycle. It is followed by the proliferative and secretory phases.

Step-by-step explanation:

The menstrual phase of the uterine cycle refers to menstruation, which is option 1 in the provided list of phases. This phase is the first part of the cycle, starting on day 1 and typically lasting from 2 to 7 days, during which the endometrium (the lining of the uterus) is shed. Following this phase, the proliferative phase begins, characterized by the rebuilding of the endometrial tissue. Finally, the secretory phase occurs after ovulation, preparing the endometrium for potential implantation of an embryo. The menstrual phase is associated with the follicular phase of the ovarian cycle, during which progesterone levels are low, leading to the shedding of the endometrial lining.