The most important chemical regulator of respiration is

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Carbon dioxide is the most important chemical regulator of respiration. Changes in the levels of carbon dioxide in the blood directly affect the rate and depth of breathing. High levels of carbon dioxide stimulate an increase in breathing rate and depth, while low levels of carbon dioxide inhibit breathing rate and depth. This helps to ensure that sufficient oxygen is delivered to the body's tissues and that excess carbon dioxide is removed.

The Most Important Chemical Regulator of Respiration Is