Assertion (A): Assertion (A): The partial pressure of carbon dioxide (pCO₂) is a more potent regulator of respiratory rhythm than the partial pressure of oxygen (pO₂). Reason (R): Reason (R): Chemoreceptors are more sensitive to changes in pCO₂ and H⁺ concentration than to changes in pO₂.
- 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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