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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Statement1: Rate of breathing is regulated by respiratory centres present in the medulla oblongata. Statement 2 : Changes in the CO2 level of the arterial blood control the rate of breathing.

The correct option is A Both statements 1 and 2 are correct.Rate of breathing is mainly controlled by CO2 level in the blood. Excess CO2 mainly stimulate the respiratory centre of the brain and increase the inspiratory and expiratory signals to the respiratory muscles.

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.

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.