The rate of breathing is controlled mainly by the

$C O_{2}$ level in blood

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pH of blood

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$O_{2}$ level in blood

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$O_{2}$ level and pH of blood

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Solution

The correct option is A
$C O_{2}$ level in blood

The rate of breathing is mainly controlled by $C O_{2}$ level in the blood. Excess $C O_{2}$ stimulates the respiratory centre of the brain and increases the inspiratory and expiratory signals to the respiratory muscles.

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