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| consists of hundreds to thousands of muscle cells, plus connective tissue wrappings, blood vessels, and nerve fibers. Covered externally by the epimysium |
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| is a discrete bundle of muscle cells, segregated from the rest of the muscle by a connective tissue sheath. Surrounded by perimysium. |
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| a muscle fiber is an elongated multinucleate cell; it has a banded (striated) appearance. Surrounded by endomysium. |
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Definition
| are rodlike contractile elements that occupy most of the muscle cell volume. Composed of sarcomeres arranged end to end, they appear banded, and bands of adjacent myofibrils are aligned |
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Definition
| is the contractile unit, composed of myofilaments made up of contractile proteins |
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Definition
| are of two types- thick and thin. Thick contain bundled myosin molecules; thin contain actin molecules. The sliding of the thin filaments past the thick filaments produces muscle shortening. Elastic filaments mantain the organization of the A band and provide elastic recoil when tension is released. |
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