Other questions in this quiz

2. Smooth muscle is slow to fatigue and is controlled by the

  • Autonomic nervous system
  • Somatic nervous system

3. Step 4 (Operation of the Neuromuscular Junction)

  • 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
  • The post synaptic membrane depolarises, if the threshold potential is reached an action potential is generated, this travels along the muscle cell membrane and into special structures called T tubules
  • 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

4. What are purkyne fibres

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

5. Contractions of this type of muscle are not under voluntary control

  • Involuntary (smooth)
  • Under voluntary control
  • Voluntary

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