Biology Respiration / Gaseous Exchange MDCAT 2018
PMDC Verified Question 24 of 34
Which of the following statement is correct about the respiratory pigments?
A
Myoglobin has more affinity for oxygen as compared to haemoglobin
B
Albumin, globulin and globular proteins are present in respiratory pigments
C
Myoglobin and haemoglobin has higher affinity for nitrogen
D
Cyanide and haemoglobin has low affinity for oxygen
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Myoglobin has more affinity for oxygen as compared to haemoglobin
Concept: Different respiratory pigments are adapted for transport versus storage of oxygen.

Solution:
  • Hemoglobin (in blood) is designed to transport oxygen; it binds it in the lungs and easily drops it off in tissues.
  • Myoglobin (in muscle tissue) acts as an oxygen reservoir. It must be able to steal oxygen away from hemoglobin.
  • Therefore, myoglobin has a significantly higher binding affinity for oxygen than hemoglobin, holding onto its \( \text{O}_2 \) tightly until the muscle experiences extreme hypoxia.


Why other options are incorrect:
  • Affinity for nitrogen: Neither pigment actively binds or transports nitrogen gas.
  • Albumin/Globulin: These are standard plasma transport/immune proteins, not oxygen-carrying respiratory pigments.

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