Other questions in this quiz

2. 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

3. Step 6 (Operation of the Neuromuscular Junction)

  • Ca2+ binds to proteins in the muscle, which leads to contraction. Acetylcholine is recycled by acetylcholineesterase so that contraction only occurs when impulsed arrives
  • ATP arriving at motor neurone causes calcium channels to open, Ca2+ ions flood into the cell

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

  • Cardiac
  • Voluntary
  • Involuntary (skeletal/striated)

5. What are the main characteristics of voluntary (skeletal/striated) muscle (time related)

  • They contract quickly and powerfully but fatigue quickly
  • The part of the atrioventricular node that carry electrical impulses
  • Contract weakly but don't fatigue

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