Terms to know for Sliding Filament Theory
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| actin | thin protein filaments within a muscle
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| action potential | the electric signal from the spine or the brain that activates a muscle
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| concentric contraction | shortening of a muscle
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| cross bridge | attach myosin filaments to active sites
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| essentric contraction | lengthening phase of muscle contraction
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| motor unit | collectively, a motor neuron and the muscle fibers which it activates
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| muscle fiber | basic muscle cells
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| myosin | thick protein filaments within a muscle
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| neuromuscular junction | point at which a motor neuron attaches to a muscle
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| sarcolemma | the membrane that encases an individual muscle fiber
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| sarcomere | smallest contractile unit of a muscle
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| sarcoplamic reticulum (SR) | runs parallel to and around each myofibril (actin and myosin winds) and contains a system of Tubules
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| T-Tubules | run perpendicular to the SR and in between myosin fibers. They deliver the action potential to the muscle fibers
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| troponon | a protein situated at regular intervals along an actin filament that binds to calcium during contraction
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| A-Band | extends the length of the myosin filaments in a sarcomere
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| I-Band | runs between myosin filaments in adjecent sarcomeres
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| H-Zone | found in the center of the sarcomere and disappears during muscular contraction
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| Z-Line | end borders of a sarcomere
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| ATP (Adenosine triphosphate) | chemical molecule needed by all cels in the body
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| Hypertrophy | the increase of the size of an organ or in a select area of the tissue
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| Hyperplasia | an increase in the number of the cells of an organ or tissue causing it to increase in size.
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