Rate of breathing is controlled by........

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(B) The rate of breathing in humans is primarily regulated by the respiratory rhythm center located in the medulla oblongata of the brain.This center

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Carbon dioxide in blood

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(B) The rate of breathing in humans is primarily regulated by the respiratory rhythm center located in the medulla oblongata of the brain.This center is highly sensitive to the concentration of $CO_2$ and hydrogen ions in the blood.An increase in the concentration of $CO_2$ in the blood stimulates the chemoreceptors,which in turn signal the respiratory rhythm center to increase the rate of breathing to eliminate excess $CO_2$ from the body.Therefore,the level of carbon dioxide in the blood is the main chemical factor controlling the breathing rate.

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