Sliding Filament Model/Power Stroke

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1. The H zone in the structure of the sarcomere is

  • The zone which lies within an A band, it only contains 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)
  • Found at the centre of the myosin filaments, no myosin heads are in this region of myosin filaments
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2. Troponin molecules are

  • Changes the shape of the troponin, which moves the tropomyosin away from the binding sites on the actin - this means cross bridges can form allowing the power stroke and muscle contraction to occur
  • bound to tropomyosin, each complex consists of three polypeptides, one binds to actin, one to tropomyosin (wound around actin) and one to calcium ions
  • Wound around the actin, reinforcing it

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. Myofibrils contained two different types of filaments: thin filaments made predominantly of actin, and

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

5. A cross bridge is

  • The name given to the attatchment formed by a myosin head binding to a binding site on an actin filament
  • Wound around the actin, reinforcing it

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