Respiratory System: Regulation of Respiration Past Year (2006 - 2015) MCQs Breathing and Exchange of Gases Zoology NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

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When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
1. Falling O₂ concentration
2. Rising CO₂ concentration
3. Falling CO₂ concentration
4. Rising CO₂ and falling O₂ concentration

Subtopic: Respiratory System: Regulation of Respiration |

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