Final answer:
Aerobic respiration in muscle fibers efficiently produces ATP using oxygen and breaking down glucose and fat.
Explanation:
Aerobic respiration in the mitochondria of muscle fibers produces ATP efficiently using oxygen, breaking down glucose and fat to generate ATP for muscle contraction. It is the preferred method by body cells, producing up to 38 ATP molecules from one glucose molecule. Different forms of exercise utilize various systems to produce ATP, with aerobic metabolism being the most efficient, generating ATP from carbohydrates, fatty acids, and proteins.
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