Question

Assertion (A): The endometrium undergoes cyclic changes during the menstrual cycle.
Reason (R): Perimetrium contracts strongly during delivery of the baby.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Remember the uterine layer functions: - Endometrium $\rightarrow$ Every month changes (Menstrual cycle). - Myometrium $\rightarrow$ Muscle contractions (Childbirth).

Answer 1

The Correct Option is C

Concept: The human uterine wall is composed of three distinct tissue layers, each adapted for specific physiological functions:
• Endometrium: The innermost glandular layer that thickens, vascularizes, and sheds cyclically during each menstrual cycle.
• Myometrium: The middle thick layer of smooth muscle that exhibits strong contractions during parturition (delivery of the baby) under the influence of oxytocin.
• Perimetrium: The outermost thin membranous serous layer providing structural covering.

Step 1: Verify the Assertion statement.
The inner lining of the uterus, the endometrium, undergoes regular cyclic degeneration and regeneration driven by ovarian steroid hormones during the menstrual cycle. Hence, Assertion (A) is true.

Step 2: Verify the Reason statement.
The Reason statement claims that the perimetrium contracts strongly during childbirth. This is factually incorrect. It is the middle muscular layer, the myometrium, that undergoes strong contractions during delivery. The perimetrium does not contract. Thus, Reason (R) is false.

Step 3: Choose the matching option combo.
Since Assertion (A) is true and Reason (R) is false, this corresponds to Option (C).