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14 Cards in this Set
- Front
- Back
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what happens to each sarcomere when muscle fiber contracts
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shortens
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what happens to muscle fiber length when muscle fiber contracts
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decreases
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in a relaxed state actin filaments
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overlap myosin filaments slightly
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during contraction actin filaments are
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pulled inward so they overlap one another
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during contraction the z-lines
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are closer in distance
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2 major structures in the "sliding filament theory"
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actin - myosin
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thick filament (myosin) structure composed of
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myosin molecules
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the head of each myosin molecule is on
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flexible arm
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myosin heads are attracted to
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active sites on actin filament
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myosin has the ability to
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cleave atp to form adp and release energy (act as ATPase enzyme)
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in actin 2 strands are double twisted coiled with a ____ strand
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tropomyosin
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troponin (protein) molecules are bound to
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tropomyosin + actin
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troponin molecules binds readily to
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calcium ions
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normally, the tropomyosin strand covers the
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myosin binding site on the actin strand
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