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During exercise, which of the following directly increases respiratory rate? A) Decrease in CO2 level in the blood B) The Bohr effect C) Lower blood pH D) Reduced oxyhemoglobin E) Anticipation of the needs of exercising muscle

User Mewtwo
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During exercise, the following factor directly increases respiratory rate:

C) Lower blood pH

Lower blood pH, often caused by an increase in carbon dioxide (CO2) due to increased metabolic activity during exercise, leads to an increase in respiratory rate. This is a response to eliminate excess CO2 and maintain blood pH within the normal range.
User SugaKookie
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