Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 48 of 99
The solute potential, total volume, and osmolarity of human blood plasma are regulated by which peptide hormone?
A
Estrogen
B
Epinephrine
C
Thyroxine
D
Vasopressin (ADH)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Vasopressin (ADH)
Concept: Hormonal regulation of plasma osmolarity.

Solution: Vasopressin (antidiuretic hormone) is released in response to high blood osmolarity, stimulating renal aquaporin channels to retain free water, lowering blood solute potential back to normal.

Why other options are incorrect:
  • Option A: Estrogen regulates reproductive cycles.

  • Option B: Epinephrine mediates sympathoadrenal fight-or-flight responses.

  • Option C: Thyroxine controls general metabolic rate.

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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