skeletal muscle contraction
About this set
Created by:
pruggle on January 18, 2010
Description:
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12 terms
Terms | Definitions |
|---|---|
 thin filament contents | actin, troponins and tropomyosin |
| thick filament contents | myosin (300 in each thick filament) |
| muscle fiber speeds | slow or fast |
| sarcomere I band -l as in light band | thin filaments without thick filaments |
| sarcomere A band -A as in dark | thin filaments overlapping thick filaments |
| Z-line | where sarcomeres abut one another |
| regulatory components of thin | troponin /tropomysin (They block actin binding sites for myosin until calcium ions move them and allow crossbridging |
| do thin or thick filaments move with contraction? | THIN- think it is easier to move a thin board rather than a thick one |
| more sarcomeres in series-think longer muscles | faster contraction |
| more sarcomeres in parallel-think wider muscles | stronger contractions |
| what actually binds with calcium ion to initiate contraction | Troponin C-which moves when calcium binds and exposes actin site for myosin to bind |
| why does rigor mortis occur? | no ATP availble to break crossbridge and allow relaxation |
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