During exercise,the increase in respiration rate and heartbeat speed are driven by the need to replenish the oxygen used to support

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During exercise, muscles undergo oxidative phosphorylation in their mitochondria to produce ATP for energy. This process requires oxygen as the final acceptor of electrons in the electron transport chain. The increase in respiration rate and heart rate is necessary to deliver more oxygen to the muscles, which allows for the continued production of ATP through oxidative phosphorylation. Lactic acid fermentation (A) occurs when muscles cannot get enough oxygen to meet their energy demands, and carbon dioxide synthesis (B) occurs during normal respiration, but is not directly related to exercise. The Calvin cycle of photosynthesis (D) is not relevant to exercise.

During Exercise,the Increase in Respiration Rate and Heartbeat Speed Are