Other questions in this quiz

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

  • Autonomic nervous system
  • Somatic nervous system

3. What are purkyne fibres

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

4. What is the role of specialised excitatory fibres?

  • They control the rhythmic heart beat
  • Actin and myosin

5. Step 1 (Operation of the Neuromuscular Junction)

  • Action potential arriving at motor neurone causes calcium channels to open, Ca2+ ions flood 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
  • 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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