Chemoreceptors located in the aortic and carotid bodies stimulate the respiratory control center in the brain when the blood __________ decreases.

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Chemoreceptors in the aortic and carotid bodies are sensitive to changes in blood pH, which is influenced by CO2 levels. A decrease in pH (indicating increased acidity due to higher CO2) stimulates the respiratory center to increase ventilation.

Chemoreceptors Located in the Aortic and Carotid Bodies Stimulate the Respiratory