Chapter 35

Chapter 35 - Chapter 35: Muscles and Skeleton An...

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Unformatted text preview: Chapter 35: Muscles and Skeleton An Introduction to the Muscular and Skeletal Systems Muscles : tissue that produces movement by contracting Composed of specialized contractile cells Skeleton : provides supportive framework for animal Maintains animal shape Provides supportive framework so muscles can generate movements Skeletal muscle Cardiac muscle Smooth muscle muscle fiber nuclei muscle fiber nuclei muscle fiber nucleus connections with gap junctions link adjacent cells Skeletal muscle Cardiac muscle Smooth muscle muscle fiber nuclei muscle fiber nuclei muscle fiber nucleus connections with gap junctions link adjacent cells Where would you find examples of each of these three types of muscles? How do they differ from each other? Types of Muscles Skeletal muscle : Attached to bones Striated (striped) appearance Produce voluntary movements Cardiac muscle : Located in the heart Also striated, although less than skeletal muscle Produce INvoluntary movements (pump blood) Smooth muscle : Not striated Located in tubular organs Produce INvoluntary movements 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 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 How is muscle tissue arranged? What are the individual parts? Skeletal Muscle Cell Structure and Function are Closely Linked Muscle tissue is made of: Muscle fibers : muscle cell, arranged parallel to each other Myofibrils : intracellular contractile element; cylindrical bundles of proteins (a) Cross section of fiber T tubules sarcoplasmic reticulum myofibril muscle fiber membrane (a) Cross section of fiber T tubules sarcoplasmic reticulum myofibril muscle fiber membrane How is muscle tissue arranged? What are the individual parts? Skeletal Muscle Cell Structure and Function are Closely Linked Myofibril composition: Thick filaments & Thin filaments Thick filaments made of myosin proteins Myosin heads project out from each myosin protein Thin filaments made primarily of actin proteins Also include troponin and tropomyosin accessory proteins 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 (b) Myofibril and sarcomere sarcomere myofibril Z lines thin filament thick filament (b) Myofibril and sarcomere sarcomere myofibril Z lines thin filament thick filament How is muscle tissue arranged? What are the individual parts? Skeletal Muscle Cell Structure and Function are Closely Linked...
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This note was uploaded on 05/04/2010 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Chapter 35 - Chapter 35: Muscles and Skeleton An...

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