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What happens here is that your cells run out of oxygen, you run out of energy, and your muscles feel sore due to the lactic acid dumped into the muscle tissues by your cells. What the body's cells are pretty convincingly trying to tell you here is- stop exercising or we will die.
Best Answer: During exercise, the cells burn oxygen faster to produce more energy for the body, which creates more carbon dioxide as a waste product. This increased carbon dioxide level is detected by the brain, which signals for a higher respiration rate to provide more oxygen for the cells.During exercise, the body's need for oxygen increases dramatically and ventilation rate is increased.The depth of breathing also increases during exercise during exercise due to the anatomical dead space of the respiratory system.The anatomical dead space is the air in the nose, mouth, larynx, tracheas, bronchi and bronchioles.his increased carbon dioxide level is detected by the brain, which signals for a higher respiration rate to provide more oxygen for the cells. During exercise, the body's need for oxygen increases dramatically and ventilation rate is increased.