Considering the role of the chemoreceptor in the regulation of the respiration rate,the most important stimulus that induces changes in ventilation is: A)partial pressure of oxygen (PO₂)in venous blood. B)partial pressure of carbon dioxide (PCO₂)in arterial blood. C)partial pressure of oxygen (PO₂)in pulmonary capillaries. D)partial pressure of oxygen (PO₂)in systemic capillaries.

Question

Quizplus · Accepted Answer

The chemoreceptors in the respiratory system are primarily stimulated by changes in the partial pressure of carbon dioxide (PCO2) in arterial blood. When the PCO2 levels in the blood increase due to increased metabolism or decreased ventilation, the chemoreceptors send signals to the respiratory control center in the brainstem, which increases the rate and depth of breathing to remove excess carbon dioxide and maintain appropriate oxygen levels in the body. Therefore, option B is the most important stimulus that induces changes in ventilation.

Considering the Role of the Chemoreceptor in the Regulation of the Respiration