CH. 35

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

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Chapter 35: Muscles and Skeleton
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An Introduction to the Muscular and Skeletal Systems Muscles : Skeleton :
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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 : Cardiac muscle : Smooth muscle :
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Skeletal Muscle Cell Structure and Function are Closely Linked 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
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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
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Skeletal Muscle Cell Structure and Function are Closely Linked
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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
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Skeletal Muscle Cell Structure and Function are Closely Linked
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(a) Cross section of fiber T tubules sarcoplasmic reticulum myofibril muscle fiber membrane
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Muscle Contraction
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(c) Thick and thin filaments thin filament thick filament (myosin) myosin heads troponin actin tropomyosin (accessory proteins)
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The Sliding-Filament Mechanism
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The Sliding-Filament Mechanism
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(a) thin filament thick filament binding sites myosin head ATP
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Contracted muscle Relaxed muscle sarcomere (b)
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Skeletal Muscle Contraction Is Controlled by the Nervous System
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Neuromuscular Junctions
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thick and thin filaments infolding of muscle fiber membrane motor neuron synaptic terminals action potential motor neuron axon muscle fiber (a) synaptic vesicles
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motor neuron synaptic terminals muscle fiber motor neuron axon
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Skeletal Muscle Contraction Is Controlled by the Nervous System
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Muscle Contraction Depends on the Availability of Calcium Ions
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Muscle Contraction Requires a Steady Supply of Energy
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Muscle Contraction Requires a Steady Supply of Energy
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Skeletal Muscle Responds to Exercise
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Cardiac Muscle Powers the Heart
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Smooth Muscle Produces Slow, Involuntary Contractions
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This note was uploaded on 02/14/2012 for the course BIO 1002 taught by Professor Hrinchevich during the Fall '10 term at LSU.

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

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