• Any of the ultramicroscopic threadlike structures composing the myofibrils of the striated muscle fibers
• Thick ones contain myosin, thin ones contain actin, and intermediate ones contain desmin and vimentin.

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• A usually voluntary striated muscle made up of elongated, mulitnucleated, transversely striated muscle fibers
• Having principally attachments to bones

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• A wispy layer of areolar connective tissue that ensheaths each individual muscle fiber
• Overlies the sarcolemma

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• A bundle of skeletal muscle fibers surrounded by connective tissue called perimysium

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• A layer of dense irregular connective tissue that ensheaths the entire muscle.
• It is continuous with the fascia and other connectivetissue wrappings of muscle including the endomysium and perimysium.
• Continuous with tendons where it becomes thicker and collagenous.
• The epimysium also protects muscles from friction against other muscles and bones.

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•  The origin of a muscle is a point at which it attahces to a bone

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• Point at which a muscle attaches to a bone

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• Bipolar myosin filaments occuring in striated muscle
• One protein responsible for muscle contraction

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• Actin filaments occuring, associated with troponon and tropomyosin, in striated muscle
• One globular protein involved in muscle contraction

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• The basic unit of muscle
• The contractile unit of a myofibril

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• The central portion of an A band in a sarcomere
• Characterized by the presence of myosin filaments

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• A fine band in the center of the H band in the myofibrils of straited muscle fibers

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• The borders that separate and link the sarcomeres within a muscle

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• The anisotropic band in sarcomeres
• Contains the entire length of a single thick filament

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• Surrounding the Z line, the sone of thin filaments that is not superimposed by thick filaments

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• Type of smooth ER found in smooth and straied muscle fibers whose function is to store and release calcium ions

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• Connects the nervous system to the muscular system via synapses between efferent nerve fibers and muscle fibers, or cells

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• The space between neurons at nerve synases across which a nerve impulse is transmitted by a neurotransmitter

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• A ehite crystalline derivative of choline that is released at the ends of nerve fibers in the somatic and parasympathetic nervous systems
• Is involved in the transmission of nerve impulses in the body

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• The flattened end of a motor neuron that transmits neural impulses to a muscle

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• An enzyme in the blood and in certain tissues that catalyzes the hydrolysis of acetylcholine

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• The reduction of a membrane potential to a less negative value
• Caused by the influx of cations, such as sodium and calcium, through ion channels in the membrane
• May lead to an electrical impulse called an action potential

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• The reestablishment of polarity, especially the return of cell membrane potential to resting potential after depolarization

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• Process of converting an electrical stimulus to a mechanical response

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• A distinctive structure consisiting of 2 globular heads on each myosin molecule which interact in the presence of calcium ions with specific sites on a thin actin filament
• Contains ATPase and generates the tension developed by a muscle fiber during a muscle action

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• A muscle protein of the I band that inhibits contraction by blocking the interaction of actin and myosin, except when influenced by troponin

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• A complex of 3 regulatory proteins that is integral to muscle contraction in skeletak and cardiac muscle

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• A compound formed in the body in anerobic metabolism of carbohydrate

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• Maintaining normal body temperature

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• Involuntary non-striated muscle, composed of spindle-shaped fibers
• Lack connective tissue sheaths, but have a fine endomysium
• 2 layers of closelt apposed fibers
• Found in walls of hollow organs

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• Alternating contactions and relaxations of smooth muscles that mix and squeeze substances through the lumen of hollow organs

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• Smooth muscle reponds to stretch only briefly and then adapts to new length
• The new length retains its ability to contract
• This enables organs such as the stomach and bladder to temporarily store contents

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