Question

which of the following is the correct order of events in the uterus in a nonpregnant female?
secretory phase, menstruation, proliferative phase
menstruation, proliferative phase, secretory phase
proliferative phase, menstruation, secretory phase
proliferative phase, secretory phase, menstruation

Explanation:

The uterine cycle in a non - pregnant female begins with menstruation (shedding of the endometrium). Then, during the proliferative phase, the endometrium thickens under the influence of estrogen. After ovulation, in the secretory phase, the endometrium is further prepared (under progesterone influence) for potential implantation. If no pregnancy occurs, menstruation follows again.

Answer:

B. Menstruation, proliferative phase, secretory phase