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14 Cards in this Set
- Front
- Back
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The 3 parts of the htin filaments?
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Actin, Troponin, Propomyocin
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A bands?
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overlapping actine and myocin
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I bands?
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actin alone
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5 steps of the cross bridge cycle?
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1. Energized cross bridges
2. Pi is released and cross bridge rotates "power stroke" 3. ATP binds myocin head; cross bridge detaches 4. Hydrolysis of ATP on myocin head energized cross bridge |
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How does tropomyocin regulate contration?
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Ca+ binds to troponin and canses a conformation change in troponomyocin which exposes the inding sites actin
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2 Ca+ binding protiens in the lateral sacs?
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calseqestin, calcreticulin
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Isometric contraction?
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non change in muscle length
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Isotonic contraction?
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There is a change in kuscle length
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Optimal length?
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produces maximal tension
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3 characteristics of different muscle types?
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myosic ATPase activity. (fast or slow twitch)
metabolism (oxidative or glycolytic) Fiber size (big small) |
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A propposed mechanism for fatigue?
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accumulation of PO4 during muscle activity that inhibits cross bridge binding to actin
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Shift in fiber type?
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Fast twitch muscles can change thier metabolism class
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fascicles?
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bundules of muscle fibers
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How is Ca+ released into the SR?
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It is released from L-type Ca+ channels then go through Ryandine receptors into the SR.
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