Sliding Filament Model/Power Stroke

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1. 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
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2. The structure of skeletal muscle goes from muscle, to bundle, to fibre, to myofibril, to sarcomeres to

  • Protein filaments
  • Together shortening the sarcomere which is the basis of muscle contraction

3. 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

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

4. The A band in the structure of the sarcomere is

  • Found at the centre of the myosin filaments, no myosin heads are in this region of myosin filaments
  • The same length as the myosin filaments, and contains H zone and M line. Actin and myosin interlock within this band
  • The region that only contains actin filaments (it is lightest coloured bands of the sarcomere, when viewed under a microscope)

5. The I band in the structure of the sarcomere is

  • The region that only contains actin filaments (it is lightest coloured bands of the sarcomere, when viewed under a microscope)
  • Defines the limits of the sarcomere, they appear as thin dark lines under a microscope
  • Found at the centre of the myosin filaments, no myosin heads are in this region of myosin filaments
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