Assertion (A): The partial pressure of CO₂ in deoxygenated blood is higher than in alveolar air. Reason (R): This pressure gradient drives the diffusion of CO₂ from the blood into the alveoli.
- ABoth A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is NOT the correct explanation of A
- CA is true but R is false
- DA is false but R is true
✓ Correct answer: A
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