Question

Respiration in muscles during heavy exercise.​

Answer 1

Answer:

During heavy exercise, some of our muscles respire anaerobically. The anaerobic respiration by muscles brings about partial breakdown of glucose (food) to form lactic acid. This lactic acid accumulates in the muscles.

Explanation:

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Answer 2

Answer:

During heavy exercise, expiratory flow limitation and prolonged expiratory time result in higher average positive intrathoracic pressures that reduce ventricular transmural pressure and act like a Valsalva manoeuver, decreasing the rate of ventricular filling during diastole and reducing stroke volume, venous return.