Muscle cells of marathon racers contain many mitochondria and use oxygen to break down fats and carbohydrates. Ninety percent of marathon runners' muscle is made up of _______.

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The Answer of Muscle cells of marathon racers contain many mitochondria and use oxygen to break down fats and carbohydrates. Ninety percent of marathon runners' muscle is made up of _______.

Muscle Cells of Marathon Racers Contain Many Mitochondria and Use