Anatomy - Chapter 9 - Repeating Contraction Cycle (Cross-Bridge)

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7 Terms

1
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  1. resting sarcomere


  • myosin heads are ready + cocked

  • cocked head requires breakdown of ATP which breaks cross bridge


2
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  1. contraction cycle


calcium ions arrive from SR

3
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  1. active sites exposed


  • calcium binds to troponin

  • tropomyosin moves out of the way


4
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  1. cross bridge forms


connection/attachment b/w myosin + actin

5
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  1. myosin head pivots


  • power stroke: myosin head goes towards midline

  • ADP + P release


6
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  1. cross bridge detaches


  • new ATP binds to myosin head

  • myosin releases from actin

  • active site can now form another cross-bridge


7
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  1. myosin reactivates


  • free myosin head splits ATP into ADP + P

  • released energy recocks myosin head until next contraction