Summary

Concept 33.1: Muscle Cells Develop Forces by Means of Cycles of Protein–Protein Interaction

Concept 33.2: Skeletal Muscles Pull on Skeletal Elements to Produce Useful Movements

Concept 33.3: Skeletal Muscle Performance Depends on ATP Supply, Cell Type, and Training

Concept 33.4: Many Distinctive Types of Muscle Have Evolved

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