STANDARDZoology-Respiratory System
STANDARD Zoology Gas Exchange and Transport MCQ Question
Type: MCQ-conceptual-Medium
When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe
A
Rising CO₂ concentration
B
Falling CO₂ concentration
C
Rising CO₂ and falling O₂ concentration
D
Falling O₂ concentration
Correct Answer
Option A
Detailed Explanation
CO₂ is released from blood in the lungs which are then expelled by and exhale. The urge to breathe does not come from the need for oxygen but rather from the build-up of carbon dioxide.
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