Muscle System
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| Epimysium | A sheath of fibrous elastic tissue surounding a muscle
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| Perimysium | The sheath of connective tissue surrounding a bundle of muscle fibers
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| Endomysium | The delicate connective tissue surrounding the individual muscular fibers within the smallest bundles.
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| Tendon | A flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.
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| Muscle Fibers | Any of the elongated cells characteristic of muscle.
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| Myoblast | A myoblast is a type of embryonic progenitor cell that differentiates to give rise to muscle cells.
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| Sarcoplasm | the cytoplasm of striated muscle cells.
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| Transverse Tubules | transverse tubule is a deep invagination of the sarcolemma, which is the plasma membrane of skeletal muscle and cardiac muscle cells.
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| Action Pontential | the change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell
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| Myofilaments | Myofilaments are the filaments of myofibrils constructed from proteins. The principal types of muscle are striated muscle, obliquely striated muscle and smooth muscle.
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| Thin Filaments | made of the protein actin
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| Thick Filaments |
Made of the protein myosin
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| Sarcoplasmic Reticulum | A membranous structure surrounding each myofibril
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| Triad | is formed by 1 T tubule and 2 Terminal cisterna
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| Cisternae | Concentrate Ca2 (via ion pumps)
Release Ca2 into sarcomeres to begin muscle contraction
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| Sarcomeres | a structural unit of a myofibril in striated muscle, consisting of a dark band and the nearer half of each adjacent pale band.
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| Myofibrils | any of the elongated contractile threads found in striated muscle cells.
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| Striated | muscle tissue in which the contractile fibrils in the cells are aligned in parallel bundles, so that their different regions form stripes visible in a microscope. Muscles of this type are attached to the skeleton by tendons and are under voluntary control
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| Troponin | a globular protein complex involved in muscle contraction. It occurs with tropomyosin in the thin filaments of muscle tissue.
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| Tropomyosin | a protein involved in muscle contraction. It is related to myosin and occurs together with troponin in the thin filaments of muscle tissue.
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| Active Site | a region on an enzyme that binds to a protein or other substance during a reaction.
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| Actin | a protein that forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cells
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| Myosin | a fibrous protein that forms (together with actin) the contractile filaments of muscle cells and is also involved in motion in other types of cells
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| Neuromuscular Junction | A neuromuscular junction is a synapse between a motor neuron and skeletal muscle. This lesson describes the events of synaptic transmission leading to contraction of skeletal muscle
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| Sarcolemma | the fine transparent tubular sheath that envelops the fibers of skeletal muscles.
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