Neurones & impulses

  • compare the nervous and endocrine systems as communication systems that co-ordinate responses to changes in the internal and external environment
  • describe the structure of a sensory neurone and a motor neurone
  • describe and explain the transmission of an action potential in a myelinated neurone and its initiation from a resting potential (the importance of sodium and potassium ions in impulse transmission should be emphasised)
  • explain the importance of the myelin sheath (saltatory conduction) in determining the speed of nerve impulses and the refractory period in determining their frequency