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why is atp important in muscle contraction why is atp important for muscle contraction during physical activity why is atp important during a muscle contraction why is atp necessary for muscle contraction why is atp essential for muscle contraction why are calcium and atp important in muscle contraction 5 why is atp important to muscle contraction why is atp so important for muscle contraction how is atp used in muscle contraction why is atp needed for muscle contraction
