Structure and Function of Skeletal Muscle Fibers
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Last updated 1:53 AM on 1/23/25
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10 Terms
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Muscle Fiber
A single cell of muscle tissue.
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Sarcomere
Basic unit of muscle contraction.
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Myofibrils
Contractile proteins in muscle cell cytoplasm.
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Actin
Thin filament protein in muscle fibers.
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Myosin
Thick filament protein in muscle fibers.
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Striation
Alternating light and dark bands in muscle.
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A Band
Dark band where actin and myosin overlap.
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I Band
Light band where actin extends beyond myosin.
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H Band
Area in A band with only myosin.
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Z Line
Zigzag line where sarcomeres intersect.
Note 
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