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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?
A
Falling $O_2$ concentration
B
Rising $CO_2$ concentration
C
Falling $CO_2$ concentration
D
Rising $CO_2$ and falling $O_2$ concentration
Detailed Solution
Chemoreceptors in the medulla, aortic arch and carotid bodies sense $CO_2$, $O_2$ and pH of blood; $CO_2$ has the stronger effect.
Holding the breath raises blood $CO_2$, which stimulates breathing, so holding the breath beyond a point becomes impossible.
Holding the breath raises blood $CO_2$, which stimulates breathing, so holding the breath beyond a point becomes impossible.