Actin and myosin are two types of protein involved in muscle contraction and movement. They interact with each other to cause muscles to contract or relax.
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Sarcomere: This is the basic unit of a muscle's contractile system, composed of actin and myosin filaments.
Muscle Fiber: A muscle cell that contains many myofibrils, which are made up of sarcomeres.
Sliding Filament Theory: This theory explains how muscles contract, with actin and myosin sliding past each other to shorten the length of a sarcomere.