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InterpretExamining Muscle Contraction Sarcomeres in muscle fibers are composed of the protein filaments actin and myosin. The sliding action of these filaments in relation to one another results in muscle contraction. Procedure1. Look at diagrams A and B. Diagram A shows a sarcomere in a relaxed muscle. Diagram B shows a sarcomere in a contracted muscle.2. Using a centimeter ruler, measure and record the length of a sarcomere, a myosin filament, and an actin filament in diagram A. Record your data in a table.3. Repeat step 2 for diagram B.
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