Biology Chemical Coordination SZABMU 2024 Reconduct
PMDC Verified Question 13 of 50
Which body function is controlled through positive feedback mechanism?
A
Labor contractions
B
Body temperature
C
Insulin production
D
Thyroxin release
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Labor contractions
Concept:

Positive feedback systems are highly unstable and are only utilized when the body needs a rapid, explosive conclusion to a biological event.

Solution:

  • Labor contractions are driven by the hormone oxytocin. As the baby's head presses on the cervix, it sends nerve impulses to the brain to release oxytocin, which makes the uterus contract harder, pushing the baby further down, triggering even more oxytocin.


  • This self-amplifying loop only terminates once the physical stretch is removed (i.e., the baby is born).


Why other options are incorrect:

Every other biological variable listed (temperature, glucose, metabolic rate) must be strictly maintained at a constant level, which is exclusively achieved via negative feedback.

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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