Muscle_Physiology_1_215.ppt

Muscle_Physiology_1_215.ppt - MusclePhysiology Chapter8...

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Muscle Physiology Chapter 8
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Three types of muscles comprise the 600 muscles in the human body: 1. Smooth 2. Cardiac 3. Skeletal/Striated
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Smooth muscle -involuntary -uninucleated (one nucleus) -spindle-shaped -often woven with connective tissue fibers -unstriated (arrangement of myosin and actin is less organized ) -contains numerous gap junctions – allows for communication Dr. M. Cambray-Deakin's Website Dr. Thomas Caceci
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Cardiac muscle -primarily involuntary -only in the heart - contains generally one nuclei - has own inherent rhythm and can contract without an external stimulus -has faint striations and are branched -gap junctions are common.
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Skeletal muscle (move the skeleton) -consciously controlled -has very long fibers (cells) which are unbranched. -contains many nuclei, -In transverse section has lines (striations) running along the short axis of the fiber Dr. M. Cambray-Deakin's Website
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Properties of Muscle Excitability- respond to stimuli
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