Operation of the Neuromuscular Junction

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1. The location of this muscle is in the walls of the intestine, when it contracts this is known as peristalsis

  • Involuntary (smooth) muscle
  • Cardiac
  • Voluntary
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2. The cytoplasm of a muscle cell is called the

  • Sarcoplasm
  • Ions
  • The part of the atrioventricular node that carry electrical impulses

3. What are purkyne fibres

  • The part of the atrioventricular node that carry electrical impulses
  • Apex

4. Slow twitch muscle fibres in skeletal muscle are used during endurance activities because they contract slowly and can work for long periods of time, they have a large number of

  • Mitochondria, a high concentration of myoglobin (basically haemoglobin) and an excellent blood supply (so sometimes called red fibres)
  • Sarcomeres and mesosomes

5. Step 2 (Operation of the Neuromuscular Junction)

  • The increased concentration of Ca2+ in the cell stimulates the vesicles which contain the neurotransmitter acetylcholine, these move towards the pre synaptic membrane and fuse with it
  • ATP arriving at motor neurone causes calcium channels to open, Ca2+ ions flood into the cell

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