Biology Chemical Coordination NUMS 2024
PMDC Verified Question 10 of 50
A desert mammal faces severe dehydration in hot sunny day. Which internal condition would lead to secretion of ADH?
A
High osmotic pressure of blood
B
High blood pressure
C
Low osmotic pressure of blood
D
Low solute potential of blood
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: High osmotic pressure of blood
Concept:

Osmotic pressure refers to how "salty" or concentrated a solution is. Water loss drives this pressure up.

Solution:

  • As the mammal sweats and exhales water vapor in the hot desert, it loses pure water from its plasma, leaving the salts behind.


  • This thickens the blood, resulting in a dangerously high osmotic pressure. Osmoreceptors in the hypothalamus shrink in response to this hypertonic blood and fire signals to release ADH to save whatever water is left in the kidneys.


Why other options are incorrect:

Dehydration causes low blood pressure. Low osmotic pressure would mean the blood is too watery, which would inhibit ADH, not stimulate it.

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.

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.