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November 27-ch 39 - Chapter 39 Muscular skeletal system...

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November 27, 2007 Chapter 39 Muscular skeletal system Muscles o Tissues that produce movement through contraction o Composed of contractile cells o Essential to organs that perform other functions Circulatory system Digestive system Skeleton o Provides supportive framework o Maintain animal shape o Provides supportive framework so muscles can generate movements Types of muscles Skeletal Cardiac Smooth Skeletal muscles o Attached to bones o Striated o Voluntary Cardiac muscles o Located in heart o Also striated o Involuntary Smooth muscles o No striated o Located in tubular organs Skeletal muscle structure Muscle tissue is made of muscle of fibers o Long muscle cells, arranged parallel o Many nuclei per cell o Each muscle fiber surrounded by plasma membrane Muscle fibers composed of many myofibrils o Intracellular contractive elements Actin and myosin o Cylindrical bundles of proteins o Surrounded by sarcoplasmic reticulum
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