The central chemoreceptors in the medulla are normally most sensitive to:
A) low oxygen level.
B) low concentration of hydrogen ions.
C) elevated oxygen level.
D) elevated carbon dioxide level.

Question

Quizplus · Accepted Answer

Central chemoreceptors in the medulla are primarily sensitive to changes in the pH of cerebrospinal fluid, which is influenced by the levels of carbon dioxide in the blood. Elevated CO2 levels lead to increased hydrogen ion concentration, stimulating these chemoreceptors to increase ventilation.

The Central Chemoreceptors in the Medulla Are Normally Most Sensitive