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Because of their mass, the threshold temperature for electrons is:
Sarcolemma
The cell membrane of a muscle fiber that encloses the cytoplasm and organelles of the cell and plays a critical role in muscle contraction.
Muscle Fiber
Muscle cell.
Myofilament
Extremely fine molecular thread helping form the myofibrils of muscle; thick myofilaments are formed of myosin, and thin myofilaments are formed of actin.
Myofibril
A basic rod-like unit of a muscle cell that is responsible for the muscle's contractile properties.
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