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MuscleTissue - Muscle Tissue Alternating contraction and...

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Muscle Tissue Alternating contraction and relaxation of cells Chemical energy changed into mechanical energy 3 Types Skeletal Attaches to bone, skin, and fascia Banded Voluntary Cardiac Autorhythmic control- involuntary Smooth Nonstriated Attached to hair follicles, organs Involuntary Functions of Muscle tissue Producing body movements Stabilizing body positions Regulating organ volumes Movement of substances within the body Producing heat Properties of Muscle Tissue Excitability- ability to propagate Conductivity- send Contractility- ability to contract Extensibility- ability to stretch Tensile strength- collagen fibers Elasticity- ability to regain original strength Skeletal Muscle- CT Superficial fascia- loose CT and fat underlying the skin Deep fascia- dense CT Epimysium- whole muscle fiber Perimysium- surrounds fascicle- bundle of 100 muscle fibers Endomysium Myocyte or myofiber- single muscle cell Nerve and blood supply Each skeletal muscle is supplied by a nerve, artery and 2 veins Each motor neuron supplies multiple cells (NMJ) Each muscle cell is supplied by one motor neuron terminal branch and is in contact with Structures of NMJ region Synaptic end bulbs are swellings of axon terminals End bulbs contain synaptic vesicles filled with ACh Motor end plate membrane contains 30 million ACh receptors Atrophy and Hypertrophy
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Atrophy Wasting away of muscles Caused by disuse (disuse atrophy) or severing of the nerve supply (denervation) Hypertrophy Increase in the diameter of muscle fiber Resulting in an increase in myofibrils, SR, and mitochondria   OLD NOTES Functions of Muscle Tissue  Produce movement Stabilize body position Regulate organ volumes
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