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Terrell is one-and-a-half years old and loves to pound colored pegs with his wooden hammer. One day Terrell's dad brings home a set of plastic bolts, nuts and wrenches for Terrell to play with. Terrell picks up a wrench and starts to pound on pegs with it. Terrell is demonstrating which process?
Plasma Membrane
A selective barrier that surrounds a cell, controlling the movement of substances in and out of the cell.
Sliding Filament Model
A theory explaining the mechanism of muscle contraction through the sliding of actin (thin) filaments over myosin (thick) filaments, shortening the sarcomere.
Muscle Contraction
The process where muscle fibers shorten or lengthen to produce movement or maintain posture.
Contraction Cycle
The series of events in muscle fibers that lead to shortening and generating force, crucial for movement.
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