Statement1: Rate of breathing is regulated by respiratory centres present in the medulla oblongata.
Statement 2 : Changes in the $C O_{2}$ level of the arterial blood control the rate of breathing.

Both statements 1 and 2 are correct.

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Statement 1 is correct but statement 2 is incorrect.

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Statement 1 is incorrect but statement 2 is correct.

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Both statements 1 and 2 a re incorrect.

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Solution

The correct option is A Both statements 1 and 2 are correct.
Rate of breathing is mainly controlled by $C O_{2}$ level in the blood. Excess $C O_{2}$ mainly stimulate the respiratory centre of the brain and increase the inspiratory and expiratory signals to the respiratory muscles.

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