Operation of the Neuromuscular Junction

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1. Step 3 (Operation of the Neuromuscular Junction)

  • Acetylcholine diffuses across the synaptic cleft, it binds to receptors on the post synaptic membrane (sarcolemma), this results in sodium channels opening and Na+ flooding into the cell
  • T tubules channel the action potential into the cell, towards the sarcoplasmic reticulum, this organelle releases stored Ca2+ ions into cell cytoplasm in response to depolarisation
  • ATP arriving at motor neurone causes calcium channels to open, Ca2+ ions flood into the cell
  • Ca2+ binds to proteins in the muscle, which leads to contraction. Acetylcholine is recycled by acetylcholineesterase so that contraction only occurs when impulsed arrive continuously
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Other questions in this quiz

2. All muscles produce a force on contraction because they contain filaments made of the proteins

  • Actin and myosin
  • Insulin
  • Cardiac

3. The cytoplasm of a muscle cell is called the

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

4. Voluntary muscle cells are said to be _________

  • Multinucleated
  • Mononucleated

5. Some types of this muscle fiber is able to contract without a nerve impulse (myogenic)

  • Involuntary (smooth)
  • Cardic
  • Voluntary


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