【Rina】評論

For a given increase in PaCO2 or [H+], the carotid bodies areless responsive than the central chemoreceptors. The peripheralchemoreceptors account for only 20% to 30% of the ventilatoryresponse to hypercapnia.5 However, they respond to increasedarterial [H+] more rapidly than the central chemoreceptors. Theexplanation is that, in contrast to the central chemoreceptors,the carotid bodies are exposed directly to arterial blood. Thebody’s initial ventilatory response to metabolic acidosis is fairlyquick, even though H+ crosses the blood-brain barrier withdifficulty...