Sliding Filament Model/Power Stroke

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1. Outline the structure of actin

  • Found at the centre of the myosin filaments, no myosin heads are in this region of myosin filaments
  • The actin filament is formed from a helix of actin sub-units, each contains a binding site for the myosin heads, two other proteins, tropomyosin and troponin are attached to the actin fibre
  • ADP and Pi, this entire process repeats, causing the sarcomere to contract fully
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2. In the third stage of 'The power stroke', the myosin heads use the energy in ATP to detach from the actin, the head group moves backwards as ATP is hydrolysed to

  • ADP and Pi, this entire process repeats, causing the sarcomere to contract fully
  • Attaching themselves to the binding sites on actin
  • Overlap more with the thick filament. This stage is specifically known as the power stroke

3. The availability of respiratory substrate and the supply of oxygen is what the level of aerobic respiration depends on in its ability to

  • 1-2 seconds worth of contraction
  • Regenerate ATP
  • Can make oxygen

4. In the first stage of 'The power stroke', myosin head groups on the myosin filaments form cross brigdes with the surrounding filaments by

  • Attaching themselves to the binding sites on actin
  • ADP and Pi, this entire process repeats, causing the sarcomere to contract fully
  • Overlap more with the thick filament. This stage is specifically known as the power stroke

5. There is only sufficient ATP available in a muscle fibre for around

  • 1-2 seconds worth of contraction
  • The phosphate group from creatine phosphate can be transfered to ADP to form ATP quickly by the enzyme creatine phosphotransferase - this enables muscle contraction for a further 2 - 4 seconds

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