Question

What happens during the proliferate, secretory, and mestration phases of the menstrual cycle?

1) The endometrium becomes increasingly vascular
2) Nutrients are secreted to prepare for implantation
3) Both A and B
4) None of the above

Answer 1

During the proliferative phase, the endometrium grows due to the secretion of estrogen. In the secretory phase, progesterone promotes changes in the endometrium. Menstruation occurs if implantation does not occur.

Step-by-step explanation:

The proliferative phase of the menstrual cycle is the second phase. During this phase, the lining of the uterus, called the endometrium, grows due to the secretion of estrogen from the maturing ovarian follicle. The estrogen also stimulates the cervix to produce thinner mucus, which helps sperm swim through the cervix and into the uterus.

The secretory phase is the third and final phase of the menstrual cycle. It is characterized by the production of progesterone by the corpus luteum, which is formed after ovulation. Progesterone promotes changes in the endometrium that make it more receptive to the implantation of a blastocyst.

Menstruation, also known as the menstrual phase, occurs at the beginning of the cycle and involves the shedding of the endometrial tissue. If implantation does not occur, the levels of progesterone decrease, causing the endometrium to thin and the spiral arteries to constrict and rupture. This results in the shedding of the endometrial tissue, along with blood, through the vagina.