| I. Oestrogen is the hormone active during proliferative phase. |
| II. The uterine endometrium and glands grow further during secretory phase. |
| III. At the end of proliferative phase, corpus luteum degenerates in the ovary. |
| IV. The cycle ends with the menstrual phase, when menstrual flow occurs and lasts for 3-5 days. |
A) I, II and III
B) II, Ill and IV
C) I and II
D) III and IV
Correct Answer: C
Solution :
Only statements I and II are correct. Menstrual cycle consists of menstrual phase, proliferative phase (follicular phase) and secretory phase (luteal phase). The cycle starts with the menstrual phase, when menstrual flow occurs and lasts for 3-5 days. Proliferative phase (\[{{5}^{th}}-{{14}^{th}}\]day) consists of growth of endometrium of uterus, Fallopian tube and vagina. At the end of secretory phase, corpus luteum degenerates in the ovary, progesterone secretion fails, the over grown uterine endometrium breaks down and menstruation takes place.
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