Biology Reproduction UHS 2023
PMDC Verified Question 31 of 81
The labour pains to expel fetus are due to action of oxytocin on:
A
Endometrium
B
Perimetrium
C
Myometrium
D
Ovaries
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Myometrium
Concept:

Childbirth (parturition) requires immense mechanical force generated by the smooth muscle layer of the uterus.

Solution:

  • The wall of the uterus has three layers: perimetrium (outer), myometrium (middle, muscular), and endometrium (inner, vascular).


  • During labor, the posterior pituitary releases oxytocin.


  • Oxytocin directly binds to receptors on the smooth muscle cells of the myometrium, causing powerful, rhythmic contractions. These contractions manifest as labor pains and physically expel the fetus.


Why other options are incorrect:

The endometrium is the inner lining shed during menstruation. The perimetrium is just a thin serous covering. Ovaries do not possess the heavy musculature required for childbirth.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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