exam questions

• describe the role of dendrites in a neurone(3)

  • to form synapses/connections with other neurones
  • intergrate/recieve impulses from other neurones
  • involved in summation
  • initiates an action potential in the axon
• compare and contrast the structure of a sensory neurone and a motor neurone(4)

  • both have a cell body containing a nucleus
  • both have an axon
  • both have dendrites at one end of the neurone and terminal branches at the other end
  • motor neurone cell body at one end of axon whereas in sensory neurone the cell body is located along the axon
• describe why there is a difference in conduction velocity for myelinated and unmyelinated neurones(5)

  • schwann cells cover the axon in a myelinated neurone
  • schwann cells provide insulation
  • depolarisation only occurs at nodes of ranvier
  • impulses jump from node to node-salatory conduction