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Skeletal Muscle
An organ made up of many muscle fibers that are bundled into structures called fascicles.
Fascicle
A bundle of muscle fibers
Muscle Fiber
A long cylindrical multinucleate cell; nuclei are just beneath the sarcolemma; sarcolemma is a specialized plasma membrane; many mitochondria provide energy for muscle contraction; contain sarcoplasmic reticulum, T tubules, and myofibrils
Sarcomere
The functional unit of muscle that produces muscular contraction and consists of repeating sections of actin and myosin.
Myofibrils
The contractile organelles of a skeletal muscle fiber that contain actin and myosin
Myofilaments
The contractile proteins, actin and myosin, of muscle cells