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What are shell variables? What are environment and user-defined variables?
Cell Membrane
The semipermeable membrane surrounding the cytoplasm of a cell, controlling the passage of substances in and out of the cell.
Muscle Fiber
The individual contractile cells of a muscle, composed of myofibrils and capable of producing force and movement.
Agonist
A chemical substance that binds to and activates specific receptors on cells, leading to a biological response.
Body Movement
The physical action resulting from the contraction of muscles, enabling humans and animals to change their position or location.
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