Rate of breathing is controlled mainly by ________________.

C O_{2}

level in blood

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pH in blood

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O_{2}

level in blood

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O_{2}

level and pH in blood.

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Solution

The correct option is C $C O_{2}$ level in blood
Rate of breathing is mainly controlled by $C O_{2}$ level in the blood. Excess $C O_{2}$ decrease the pH of the blood and it mainly stimulate the respiratory centre of the brain (i.e., Medulla oblongata) and increase the inspiratory and expiratory signals to the respiratory muscles.

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