NEET2015Zoology-Breathing and Exchange of Gases
NEET 2015 Zoology Regulation of Respiration MCQ Question
Type: MCQ-conceptual-Medium-Class 11
When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
A
Falling CO₂ concentration
B
Rising CO₂ and falling O₂ concentration
C
Falling O₂ concentration
D
Rising CO₂ concentration
Correct Answer
Option A
Detailed Explanation
The primary drive to breathe is due to rising CO₂ levels in the blood, which is detected by chemoreceptors.
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