The carotid bodies contain ________ chemoreceptors that respond to changes in ________.
A. peripheral; concentrations of carbon, dust, and pollution in the lungs
B. central; blood concentrations of H+, but not CO2 and O2
C. peripheral; cerebrospinal fluid concentrations of H+
D. peripheral; blood concentrations of H+ and O2
E. central; cerebrospinal concentrations of CO2
Answer: D
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