Chapter 35 (noteswap)

Chapter 35 (noteswap) - Chapter 35 Muscles and Skeleton An...

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Chapter 35: Muscles and Skeleton
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An Introduction to the Muscular and Skeletal Systems Muscles : tissue that produces movement by contracting Composed of contractile cells Skeleton : provides supportive framework for animal Maintains animal shape Provides supportive framework so muscles can generate movements
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Skeletal muscle Cardiac muscle Smooth muscle muscle fiber nuclei muscle fiber nuclei muscle fiber nucleus connections with gap junctions link adjacent cells
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Types of Muscles Skeletal muscle : Attached to bones Striated appearance (striped) Produce voluntary movements Cardiac muscle : Located in the heart (and around it) Also striated, although less than skeletal muscle Produce involuntary movements (pump blood) Smooth muscle : Not striated Located in tubular organs Produce involuntary movements
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Skeletal Muscle Cell Structure and Function are Closely Linked Skeletal muscle attaches to the skeleton by tendons: Tough cords of collagen fibers tendon Skeletal muscle Muscle fiber Myofibril connective tissue nerve and blood vessels
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Skeletal Muscle Cell Structure and Function are Closely Linked Muscle tissue is made of: Muscle fibers: muscle cell, arranged in parallel to each other Myofibrils: intracellular contractile element; cylindrical bundles of proteins
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(a) Cross section of fiber T tubules sarcoplasmic reticulum myofibril muscle fiber membrane
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Skeletal Muscle Cell Structure and Function are Closely Linked Myofibril composition: Thick filaments made of myosin proteins Myosin heads project out from each myosin protein Thin filaments made of primarily of actin proteins Also include troponin and tropomyosin accessory proteins
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Skeletal Muscle Cell Structure and Function are Closely Linked Thick and thin filaments are arranged in repeating units called sarcomeres Myofibril composition is illustrated in next slide…
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(b) Myofibril and sarcomere sarcomere myofibril Z lines thin filament thick filament
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Skeletal Muscle Cell Structure and Function are Closely Linked Sarcomeres: The fundamental contractile unit of muscle Thin actin filaments overlap thick myosin filaments Actin filaments attach to Z-lines bordering each sarcomeres
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Function are Closely Linked Other muscle fiber structures: Sacroplasmic reticulum: calcium storage
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This note was uploaded on 04/17/2008 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Chapter 35 (noteswap) - Chapter 35 Muscles and Skeleton An...

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