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Actin
A globular structural protein that forms microfilaments, playing a vital role in muscle contraction, cell motility, and the maintenance of cell shape.
Muscle Fiber
Individual muscle cells that contract to generate force, constituting skeletal muscles.
Action Potential
A rapid rise and fall in electrical potential across a cell's membrane, enabling the transmission of signals along neurons.
Threshold Level
The minimum level of stimulus intensity required to activate a neuron or to trigger a specific physiological response.
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