Which parameter do chemoreceptors primarily respond to in regulating breathing?

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Multiple Choice

Which parameter do chemoreceptors primarily respond to in regulating breathing?

Explanation:
Chemoreceptors regulate breathing mainly through changes in hydrogen ion concentration, i.e., pH. Central chemoreceptors in the brainstem sense CSF pH; since CO2 easily crosses into the CSF and forms carbonic acid, shifts in arterial CO2 alter CSF pH. When CO2 rises, CSF pH falls, stimulating ventilation to expel CO2; when CO2 falls, pH rises, ventilation decreases. Oxygen levels can influence breathing, but they’re a secondary driver under normal conditions. So the parameter most directly monitored by chemoreceptors to regulate breathing is pH.

Chemoreceptors regulate breathing mainly through changes in hydrogen ion concentration, i.e., pH. Central chemoreceptors in the brainstem sense CSF pH; since CO2 easily crosses into the CSF and forms carbonic acid, shifts in arterial CO2 alter CSF pH. When CO2 rises, CSF pH falls, stimulating ventilation to expel CO2; when CO2 falls, pH rises, ventilation decreases. Oxygen levels can influence breathing, but they’re a secondary driver under normal conditions. So the parameter most directly monitored by chemoreceptors to regulate breathing is pH.

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