molecular basis of muscle contraction

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Created by
Lyla Bensley

Cards (8)

  • diagram
    1. tropomyosin molecule prevents myosin head from attaching to the binding site on the actin molecule
  • 2. calcium ions released from the endoplasmic reticulum cause the tropomyosin molecule to pull away from the binding sites on the actin molecule
  • 2. myosin head now attaches to the binding site on the actin filament
  • 4. head of myosin changes angle, moving the actin filament along as it does so. the ADP molecule is released
  • 5. ATP molecule fixes to myosin head, causing it to detach from the actin filament
  • 6. hydrolysis of ATP to ADP by myosin provides the energy for the myosin head to resume its normal position
  • 7. head of myosin reattaches to a binding site further along the actin filament and the cycle is repeated