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Consider the given statements. I. Pro...

Consider the given statements.
I. Proliferative phase is caused by the increased production of oestrogens.
II. During luteal phase endometrium thickness increases upto 10 mm.
III. Menstrual flow includes blood only.
IV. During ovulatory phase primary oocyte is released.
Choose the correct statements.

A

I and II

B

I and III

C

II and III

D

III and IV

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the statements about the menstrual cycle, we will evaluate each statement one by one: ### Step 1: Analyze Statement I **Statement I:** Proliferative phase is caused by the increased production of oestrogens. - The proliferative phase, which occurs after menstruation, is indeed characterized by the increase in estrogen levels, primarily 17 beta estradiol. This hormone promotes the thickening of the endometrium in preparation for potential implantation of an embryo. **Conclusion:** This statement is **correct**. ### Step 2: Analyze Statement II **Statement II:** During luteal phase endometrium thickness increases up to 10 mm. - During the luteal phase, the endometrium continues to thicken due to the influence of progesterone, which is secreted by the corpus luteum. The endometrial thickness can reach approximately 10 to 11 mm during this phase. **Conclusion:** This statement is **correct**. ### Step 3: Analyze Statement III **Statement III:** Menstrual flow includes blood only. - Menstrual flow does include blood, but it also contains other components such as cervical mucus, vaginal secretions, and endometrial tissue. Therefore, it is not accurate to say that menstrual flow consists of blood only. **Conclusion:** This statement is **incorrect**. ### Step 4: Analyze Statement IV **Statement IV:** During ovulatory phase primary oocyte is released. - During ovulation, the primary oocyte completes its first meiotic division to become a secondary oocyte, which is then released. Thus, it is the secondary oocyte that is released during ovulation, not the primary oocyte. **Conclusion:** This statement is **incorrect**. ### Final Conclusion The correct statements are: - Statement I: Correct - Statement II: Correct - Statement III: Incorrect - Statement IV: Incorrect Therefore, the correct statements are **I and II**. ---
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