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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?

NTA AbhyasNTA Abhyas 2022

Solution:

The rise in $CO_{2}$ concentration stimulates chemoreceptors present in the aorta and carotid artery, which stimulates the respiratory centre. The respiratory centre is not directly sensitive to oxygen concentration & hence desire to breathe is induced by rising in $CO_{2}$ the concentration of blood.