Muscular System
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each of the black spaces below before clicking
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| Epimysium | Exterior collagen layer; separates muscle from surrounding tissue
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| Perimysium | Surrounds muscle fiber bundles
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| Endomysium | surrounds individual muscle cells (muscle fibers)
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| Tendon | a fibrous connective tissue which attaches muscle to bone.
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| Muscle Fibers | a muscle cell
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| Myoblast | a type of embryonic progenitor cell that differentiates to give rise to muscle cells
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| Sacroplasm | the cytoplasm of striated muscle cells
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| Transverse Tubules | a cavity formed in the plasma membrane in the skeletal system
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| Action Potential | 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 | are the filaments of myofibrils constructed from proteins
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| Thin Filaments | filament that contain actin
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| Thick Filaments | filament that contain protein myosin
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| Sarcoplasmic Reticulum | is a specialized type of smooth ER that regulates the calcium ion concentration in the cytoplasm of striated muscle cells.
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| Triad | is the structure formed by a T tubule with a sarcoplasmic reticulum on each side
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| Cisternae | a flattened membrane disk that makes up the Golgi apparatus.
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| Sarcomeres | a structural unit of a myofibril in striated muscle
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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
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| Troponin | a globular protein complex involved in muscle contraction
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| Tropomysin | a protein involved in muscle contraction
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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,
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| Myosin | a fibrous protein that forms (together with actin) the contractile filaments of muscle cells
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| Neuromuscular Junction | the site of communication between motor nerve axons and muscle fibres
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