The amount of lactic acid in the blood was measured in subjects after various amounts of time running. How does the respiration of the person change throughout the run? The cells started with anaerobic respiration, but changed to aerobic when the oxygen levels increased. The cells started with anaerobic respiration, but changed to aerobic when oxygen levels decreased. The cells started with aerobic respiration, but changed to anaerobic when oxygen levels decreased. The cells started with aerobic respiration, but changed to anaerobic when oxygen levels increased.
