The Muscular System 7.1-7.3
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| Skeletal Muscles | Muscles that are cylindrical, have many nuclei, alternating light and dark bands. The muscles attach directly to the skeleton or skin. Voluntarily controlled.
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| Cardiac Muscle | Muscles of the heart. Striated and cylindrical with one to two nuclei. These muscles are branched and have intercalated disks. Involuntarily controlled.
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| Smooth Muscle | Located within body organs. Spindle shaped cells that are narrow and have one nucleus. Involuntarily controlled.
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| Endomysium | A layer of loose connective tissue that surrounds each muscle fiber.
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| Fascicle | A group of muscle fibers bundled together.
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| Perimysium | The connective covering surrounding fascicles.
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| Epimysium | The outermost connective tissue layer that surrounds the entire muscle.
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| Tendon | An accumulation of collagen fibers that attach a muscle to a bone.
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| Sarcolemma | The plasma membrane of a muscle fiber.
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| Sarcoplasm | The cytoplasm of a muscle fiber.
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| Sarcoplasmic reticulum | The endoplasmic reticulum of a muscle fiber.
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| T Tubules | Conduct impulses for a muscle cell that reach from the sarcolemma to the sarcoplasmic reticulum.
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| Myofibrils | Bundles of myofiliaments. Myofibrils are the part of the muscle that contract.
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| Myoglobin | A protein and pigment that acts as oxygen storage molecule.
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| Sarcomeres | Repeating units found found within a muscle, made up of Z lines, A bands, H zones, and I bands.
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| Z Lines | Two dark vertical lines that mark the ends of a sarcomere.
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| I Band | A region of thin filaments at the ends of a sarcomere that attach to the Z Line.
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| A Bands | Regions of thick and thin filaments
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| H Zone | A region in the center of A bands that only contain myosin.
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| Thick Filaments | A filament made up of only myosin and is part of the A Band and H Zone.
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| Thin Filaments | Made up of three proteins: Actin, tropomyosin, and troponin.
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