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The urge to inhale in humans results fro...

The urge to inhale in humans results from

A

rising `PCO_(2)`

B

rising `PO_(2)`

C

falling `PCO_(2)`

D

falling `PO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Excess `CO_(2)` mainly stimulates the respiratory centre of the brain and increase the inspiratory and expiratory signal to the respiratory muscles. `O_(2)` does not have a significant direct effect on the respiratory centre of the brain in controlling respiration.
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NCERT FINGERTIPS-BREATHING AND EXCHANGE OF GASES-Breathing And Exchange Of Gases
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