The urge to inhale in humans results from

rising P

C O_{2}

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rising

P O_{2}

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falling P

C O_{2}

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falling

P O_{2}

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Solution

The correct option is A rising P $C O_{2}$
Excess $C O_{2}$ mainly stimulates the respiratory centre of the brain and increase the inspiratory and expiratory signals 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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