6. Muscle contraction is highly demanding of cellular energy. Describe how any subtype of muscle (all 3 subtypes of skeletal, contractile cardiac, and two subtypes of smooth) stores energy-producing molecules and how energy-producing molecules increase ATP levels during contraction. Compare and contrast the three subtypes of skeletal muscle fibers functionally, histologically, and energetically. Use these features to explain why the size principle recruit slow oxidative fibers first, then fast oxidative and finally fast glycolytic.

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