Operation of the Neuromuscular Junction

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1. This type of muscle has a striped pattern, contracts quickly and powerfully but fatigues quickly

  • Voluntary
  • Involuntary (skeletal/striated)
  • Cardiac
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2. What feature of intercalated disks in the cardiac muscle allows the action potential to pass easily between cardiac muscle fibres

  • Gaps junctions which allows free diffusion of ions
  • The part of the atrioventricular node that carry electrical impulses

3. What are the three types of cardiac muscle

  • Atrial, Ventricular, specialised excitatory and conductive muscle fibres
  • Actin and myosin

4. These adaptations (in slow twitch) help to maintain aerobic respiration in the tissue, making slow twitch fibres very slow to fatigue, however, ATP generation is slower than in fast twitch fibres therefore

  • The contractions of slow twitch fibres are weaker
  • the contractions of slow twitch fibres are stronger

5. Approximatley how wide are voluntary skeletal/striated muscle fibres

  • 100um
  • 5um

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