character: Actin and Myosin
topic: Interaction in Muscle Contraction
grade: 12
subject: Physical Education
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character: Muscle fibers
topic: Structure and Role in Contraction
grade: 12
subject: Physical Education
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character: ATP
topic: Energy Source for Muscle Contraction
grade: 12
subject: Physical Education
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character: Calcium ions
topic: Role in Muscle Contraction Regulation
grade: 12
subject: Physical Education
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