The part of the endometrium that undergoes cyclical changes in response to sexual hormonal levels is the ______.
serosa
functional zone
muscular myometrium
basilar zone
none of the choices is correct
Answer:
functional zone
Explanation:
The endometrium of the uterus is a highly vascularized layer. The endometrium has the innermost of simple columnar epithelium, thick stroma, and the endometrial glands. Functionally, the endometrium has two layers. The functional layer or the functional zone is also called stratum functionalis. It serves to line the uterine cavity and sloughs off during menstruation. The basal layer is deeper and is called stratum basalis. It is permanent and forms a new functional zone after each menstruation.
