Biology Chemical Coordination SZABMU 2023
PMDC Verified Question 24 of 50
Which body function is controlled through positive feed-back mechanism?
A
Labor pains
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 pains
Concept:

Positive feedback mechanisms are rare in biology because they rapidly drive physiological variables to extremes.

Solution:

  • Labor pains (contractions) represent one of the few essential positive feedback loops.


  • The pain/stretch of the cervix causes a massive surge in oxytocin, which creates an even harder contraction, causing more stretch, more pain, and more oxytocin, ending only when the infant is expelled.


Why other options are incorrect:

Body temperature and metabolic hormone levels (insulin, thyroxin) must be kept strictly stable via negative feedback.

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