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Carbon dioxide is the primary stimulus for respiration as it affects blood pH and triggers the respiratory center in the medulla.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Disorders - Asthma Emphysema Occupational Disorders
High CO₂ levels stimulate the respiratory centers in the brain to regulate breathing rate.
Ref: NCERT Class 11 Biology Chapter 14: Breathing and Exchange of Gases Respiratory Disorders - Asthma Emphysema Occupational Disorders
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