Which of the following centers responds more strongly to high levels of CO2?
a. Aortic chemoreceptors
b. Carotid chemoreceptors
c. Central chemoreceptors
d. Ventral respiratory centers
ANS: C
For a given increase in PaCO2 or hydrogen ion concentration, the carotid bodies are less respon-sive than the central chemoreceptors. The peripheral chemoreceptors account for only 20% to 30% of the ventilatory response to hypercapnia.
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