You are studying for a physiology test over the respiratory system. What should you know about central chemoreceptors in the medulla?
A) They respond to changes in CO2 levels and hydrogen ion concentrations (pH) in the cerebrospinal fluid.
B) They respond to changes in the O2 levels in the brain.
C) They respond to changes in CO2 levels in the brain.
D) They respond to changes in O2 levels and bicarbonate levels in the cerebrospinal fluid.
A
Feedback:
Central chemoreceptors in the medulla respond to changes in CO2 levels and hydrogen ion concentrations (pH) in the cerebrospinal fluid. Central chemoreceptors do not respond to changes in the O2 levels in the brain, changes in CO2 levels in the brain, changes in O2 levels, and bicarbonate levels in the cerebrospinal fluid.
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