april 7 - Muscle Characteristics excitable: respond to...

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Muscle Characteristics excitable: respond to stimuli contractile: ability to shorten extensible: ability to stretch elastic: return to original length Skeletal Muscle Muscles responsible for moving body Interact with skeleton and cause bones to move relative to each other More than 600 Which branch of the nervous system is responsible for controlling the skeletal muscles? autonomic somatic afferent sympathetic parasympathetic Skeletal Muscle Structure a muscle is composed of many muscle cells (fibers) fascicle = bundle of muscle cells fascia = sheath of connective tissue that encloses fascicle and muscle Skeletal Muscle Cell Structure tube shaped larger and longer than most other cells multi-nucleate packed with myofibrils = bundles of contractile proteins myosin (thick) filaments actin (thin) filaments stripes due to arrangement The sarcomere is the repeating unit down the length of the myofibril. contractile unit
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This note was uploaded on 04/08/2009 for the course BIO 309D taught by Professor Jessicawandelt during the Spring '08 term at University of Texas at Austin.

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april 7 - Muscle Characteristics excitable: respond to...

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