Sliding Filament Model/Power Stroke

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1. The H zone 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
  • Defines the limits of the sarcomere, they appear as thin dark lines under a microscope
  • The zone which lies within an A band, it only contains myosin filaments
  • The region that only contains actin filaments (it is lightest coloured bands of the sarcomere, when viewed under a microscope)
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2. Myofibrils are organelles, muscle fibre is

  • A plain
  • A bird
  • A cell
  • A fly

3. 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

4. The M line 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
  • Defines the limits of the sarcomere, they appear as thin dark lines under a microscope
  • The region that only contains actin filaments (it is lightest coloured bands of the sarcomere, when viewed under a microscope)

5. Outline the structure of myosin

  • The myosin filament is formed from a number of myosin proteins wound together, each ends in a myosin head, which contains an ATPase
  • ADP and Pi, this entire process repeats, causing the sarcomere to contract fully

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