Chemoreceptors in the brain are activated primarily by the presence of __________ in the cerebrospinal fluid.
A. hydrogen ions
B. oxygen ions
C. carbonic acid
D. bicarbonate ions
Answer: A
Chemoreceptors in the brain are activated primarily by the presence of __________ in the cerebrospinal fluid.
A. hydrogen ions
B. oxygen ions
C. carbonic acid
D. bicarbonate ions
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