BRAINCAKEChemoreceptors
Chemoreceptors detect chemical changes in the blood, mainly changes in pH caused by carbon dioxide concentration. They are found in the aorta, the carotid arteries and the medulla oblongata.
During exercise, muscles respire faster and release more carbon dioxide into the blood. Carbon dioxide reacts with water to form carbonic acid, which dissociates to release hydrogen ions:
CO2 + H2O → H2CO3 → H+ + HCO3−
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