1. Tardigrade
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  4. When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?

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Q. When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?

AIPMTAIPMT 2015Breathing and Exchange of Gases

Solution:

Excess CO2 mainly stimulates the respiratory centre of the brain and increases the inspiratory and expiratory signals to the respiratory muscles. O2 does not have a significant direct effect on the respiratory centre of the brain in controlling respiration.