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Unformatted text preview: 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 • 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...
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This note was uploaded on 04/07/2008 for the course KIN 2500 taught by Professor Hargroder during the Spring '08 term at LSU.
- Spring '08