Sliding Filament Model/Power Stroke

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

  • Overlap more with the thick filament. This stage is specifically known as the power stroke
  • Attaching themselves to the binding sites on actin
  • ADP and Pi, this entire process repeats, causing the sarcomere to contract fully
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2. Each sarcomere is made up of protein filaments which slide

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

3. Myofibrils are organelles, muscle fibre is

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

4. The pattern of banding on myofibrils is caused by the sarcomeres, these are the smallest

  • A large number of myofibrils within the sarcoplasm they, like fibres, exhibit a striated pattern under the microscope
  • Contractile units of the muscle and are arranged end to end for the entire length of the myofibril
  • Groups of muscle fibres surrounded by connective tissue containing blood vessels and nerves

5. ATP supply is maintained by aerobic respiration, anaerobic respiration and transfer from creatine phosphate in the muscle cell sarcoplasm -

  • 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
  • 1-2 seconds worth of contraction


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