Biology Respiration / Gaseous Exchange UHS 2023
PMDC Verified Question 9 of 34
The method of bringing oxygenated air into contact with a gas exchange surface is called:
A
Photorespiration
B
Gas transport
C
Respiration
D
Ventilation
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Ventilation
Concept: It is vital to distinguish between the cellular, vascular, and purely mechanical aspects of breathing.

Solution:
  • Ventilation (commonly called breathing) is strictly the physical, mechanical process of pumping fresh air into the lungs (inspiration) and expelling stale air (expiration).
  • It acts purely as a delivery system to bring oxygenated air into physical contact with the alveolar gas exchange surface.


Why other options are incorrect:
  • Respiration: Generally refers to the overall process including internal cellular respiration (ATP production) or the actual chemical diffusion of gases.
  • Gas transport: The movement of gases through the bloodstream via hemoglobin, after they cross the exchange surface.
  • Photorespiration: A wasteful metabolic pathway in plants.

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.

Previous Question All Respiration / Gaseous Exchange MCQs Next Question

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.

Enter Arena Sprint iOS App Android App