Sliding Filament Model/Power Stroke

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1. The Z line in the structure of the sarcomere

  • 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)
  • Found at the centre of the myosin filaments, no myosin heads are in this region of myosin filaments
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2. Myofibrils contained two different types of filaments: thin filaments made predominantly of actin, and

  • Found at the centre of the myosin filaments, no myosin heads are in this region of myosin filaments
  • Thick filaments made of myosin
  • Together shortening the sarcomere which is the basis of muscle contraction

3. The M line 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)
  • 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

4. 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

5. 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

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