Which of the following conditions is responsi | vedclass

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(A) The ventilation rate of the lungs is primarily regulated by the respiratory rhythm center in the medulla oblongata.Chemosensitive areas situated a

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Increase of $CO_2$ content in inhaled air

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(A) The ventilation rate of the lungs is primarily regulated by the respiratory rhythm center in the medulla oblongata.Chemosensitive areas situated adjacent to the rhythm center are highly sensitive to $CO_2$ and hydrogen ions.An increase in the concentration of $CO_2$ in the blood (hypercapnia) stimulates these chemoreceptors,which in turn signal the respiratory rhythm center to increase the rate of ventilation to eliminate excess $CO_2$ from the body.Therefore,an increase in $CO_2$ content in the inhaled air (or blood) is the primary factor that triggers an increase in the ventilation rate.

Which of the following conditions is responsible for an increase in the ventilation rate of the lungs?

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