Which of the following is/are phase(s) of the uterine cycle?
a. menstrual phase only
b. both menstrual and secretory phases
c. proliferative phase only
d. secretory phase only
e. menstrual, secretory, and proliferative phases

e. menstrual, secretory, and proliferative phases

Explanation:

Proliferative phase (days 5-15) includes thickening of the endometrium of the uterine wall under the influence of estrogen hormone released by developing follicles.  

This is followed by secretory phase (days 15-28) during which endometrium proliferate at a fast rate and the matured uterine glands secrete mucoid secretion.

If fertilization does not occur, the secretory phase is followed by menstrual phase (days 1-5) during which the endometrium is disintegrated and the associated blood vessels rupture leading to menses.  

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