Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 26 of 99
Under healthy physiological conditions, human tissue cells maintain an internal fluid concentration that is ____ relative to the surrounding interstitial fluid.
A
Hypotonic
B
Isotonic
C
Hypertonic
D
Hyperosmotic
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Isotonic
Concept: Fluid balance and cell volume maintenance.

Solution: Plasma and interstitial fluids are kept isotonic (iso-osmotic) relative to intracellular fluid to prevent net movement of water that would cause cell lysis or crenation.

Why other options are incorrect:
  • Option A: A hypotonic surrounding fluid causes cells to swell and burst.

  • Option C & Option D: A hypertonic surrounding fluid causes cells to shrink (crenate).

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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