What Changes Occur in the Endometrium as the Time of Possible

Question

What changes occur in the endometrium as the time of possible fertilization approaches?
A) Menstruation occurs.
B) The endometrium enters the proliferative phase.
C) The endometrium enters the secretory phase.
D) The endometrium secretes estrogen.

Accepted Answer

As the time of possible fertilization approaches, the endometrium enters the secretory phase. This phase involves the secretion of nutrients and fluids to create a nourishing environment for a potential embryo. This is in preparation for implantation and early development. Menstruation occurs if fertilization does not occur and the endometrium breaks down and is shed. The proliferative phase occurs earlier in the menstrual cycle and involves the thickening of the endometrium in response to estrogen. While the endometrium does secrete estrogen, this is not a specific change that occurs as the time of possible fertilization approaches.