Sliding Filament Mechanism (Muscle Contraction) AQA Unit 5

Mindmap of sliding filament mechanism, This is how i find easiest to remember.

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  • Sliding Filament Mechanism
    • Action Potential travels to Sarcoplasm
      • Starting
      • Sarcoplasmic Reticulum actively transported Ca2+ in
        • Action potential causes Ca2+ to diffuse into sarcoplasm
          • Ca2+ cause tropomyosin molecules to pull away from myosin binding site
            • ADP on myosin head binds to actin filament, forms a cross-bridge
              • Myosin head change their angle, pulling actin filament, releasing ADP
                • ATP binds to myosin head, causing it to detach from actin
                  • Ca2+ activate ATPase. ATP forms ADP+Pi+E.
                    • This energy is used to return myosin head to original position
    • Sarcoplasmic Reticulum actively transported Ca2+ in
      • Action potential causes Ca2+ to diffuse into sarcoplasm
        • Ca2+ cause tropomyosin molecules to pull away from myosin binding site
          • ADP on myosin head binds to actin filament, forms a cross-bridge
            • Myosin head change their angle, pulling actin filament, releasing ADP
              • ATP binds to myosin head, causing it to detach from actin
                • Ca2+ activate ATPase. ATP forms ADP+Pi+E.
                  • This energy is used to return myosin head to original position

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