skeletal skeletal – striated, multinucleate, voluntary, smooth smooth - found in walls of hollow...
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SkeletalSkeletal – striated, multinucleate, voluntary,
SmoothSmooth - found in walls of hollow visceral organs; ex. stomach, bladder, respiratory passages; visceral, nonstriated, involuntary; discuss peristalsis
CardiacCardiac – in heart only, striated, involuntary, intercalcated disks
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Muscle function:• produce movement• maintain posture• stabilize joints• generate heat
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Functional Characteristics:• Excitability- respond to a stimulus• Contractility- ability to shorten
forcibly when adequately stimulated • Extensibility- the ability to be
stretched• Elasticity- the ability of a muscle
fiber to resume its resting length after being stretched
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Skeletal Muscle Skeletal Muscle TissueTissue
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Smooth Muscle Smooth Muscle TissueTissue
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Cardiac Muscle Cardiac Muscle TissueTissue
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Gross Anatomy Skeletal Muscle
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bundle of muscle fibers
muscle fiber(cell)
myofibril
sarcomere
Muscle Muscle AnatomyAnatomy
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Muscle Fiber
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Myofibril
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SarcomereSarcomere
Z lines
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SarcomeSarcomerere A band
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SarcomeSarcomerere I bands
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SarcomeSarcomerere H zone
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Actin and Myosin FilamentsActin and Myosin Filaments
myosinactin
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Myosin (Thick) FilamentMyosin (Thick) Filament
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Actin (Thin) FilamentActin (Thin) Filament
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Sliding Filament HypothesisSliding Filament Hypothesis
A
Z ZH
I I
AI I
Z ZH
Z ZHAI I
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Actin & Myosin InteractionActin & Myosin Interaction
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Biology 100Biology 100Human BiologyHuman Biology
Motor UnitMotor Unit
spinal cord
motor neurons
muscle bundle
muscle fibers
neuromuscular junctions
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Neuromuscular Neuromuscular junctionsjunctions
branching axon branching axon to motor unitto motor unit
muscle fibersmuscle fibers
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axon
plasma membrane
myofibrils
sarcomere
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T tubules
sarcoplasmic reticulum
http://www.blackwellpublishing.com/matthews/myosin.html
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Stimulation of Skeletal Muscle