Rate of breathing is increased by

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(D) The rate of breathing is primarily regulated by the chemical composition of the blood,specifically the concentration of $H^+$ ions and $CO_2$.When

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(D) The rate of breathing is primarily regulated by the chemical composition of the blood,specifically the concentration of $H^+$ ions and $CO_2$.When the acidity of the blood increases (due to an increase in $H^+$ ions),these ions react to form $CO_2$ and $H_2O$.The respiratory center in the medulla oblongata detects the rise in $CO_2$ and acidity,which triggers an increase in the rate and depth of breathing to expel excess $CO_2$ from the body.Similarly,during hard physical labor,the metabolic rate increases,leading to higher production of $CO_2$ and lactic acid,which also stimulates the respiratory center to increase the breathing rate.Therefore,both an increase in acidity and hard labor contribute to an increased rate of breathing.

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