avs350L_Bone_lecture

avs350L_Bone_lecture - Muscles Function • Primary role is...

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Unformatted text preview: Muscles Function • Primary role is movement of the skeletal system – Several exceptions: • Facial muscles • Eye movement & eyelid muscles • Tongue • Diaphragm • Upper esophagus Three types of muscle • Cardiac muscle – makes up the wall of the heart • Smooth muscle - found in the walls is hallow organs of the body (except the heart) • Skeletal muscle (striated muscle) – muscle attached to skeleton academic.wsc.edu/.../351/actin_myosin.jpg myofilaments • tendon- connects skeletal muscle to bone • epimysium- fibrous connective tissue around belly of skeletal muscle • fasiculi- bundles of muscle fibers • perimysium- connective tissue surrounding fasciculus • endomysium- connective tissue surrounding the individual muscle fibers (muscle cell) • muscle fiber- single muscle cell (threadlike in shape) • sarcolemma – membrane surrounding the muscle fiber • sarcoplasm- specialized cytoplasm of muscle fiber containing multiple nuclei and mitochondria • myofibrils- "rod-like" structures running through the muscle fibers that contain the contractile proteins actin an myosin that give the skeletal muscle the striated appearance myofilamnets www.agen.ufl.edu/~chyn/age2062/lect/lect_19/179.gi www.academic.wsc.edu/.../351/actin_myosin.jpg Sarcomere • Functional unit of muscle contraction • Extends from Z line to Z line – Connect neighboring myofibrils • A band (dark) – area of thick filament with some thin filament over lap – Thick filament - myosin protein • H zone – portion of a band where thin and thick filaments do not overlap – Thin filament – actin protein • M line – within the H zone, holds thick filaments in place • I band (light) – area of thin filaments where they do not overlap thick filaments //users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Muscles.html As a muscle contraction: • The z line comes closer together • The width of the I band decrease • The width of the H zone decreases, but • There is no change in the with a the A band As a muscle is stretched: • The width of the I bands and the H zone increases • There is still no change in the width of the a band biology.kenyon.edu/.../biol105/html/muscle2.jpg Muscle Cell Growth myogenesis • Each muscle fiber arises from the fusion of many cells called myoblast....
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avs350L_Bone_lecture - Muscles Function • Primary role is...

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