Neurones

• what is the role of neurones?


  transmission of electrical impulses rapidly around the body
• structure of a neurone


  cell body, dendrons/dendrites, axons
• types of neurone

  sensory, relay, motor
• function of sensory neurone


  carry impulse from receptor to relay or motor neurone
• function of relay neurone


  transmit impulses between neurones
• function of motor neurone


  transmit from sensory/relay neurone to an effector
• what is a myelinated neurone


  axons covered in myelin sheath
• importance of myeline sheath


  acts as insulation, allowing impulse to travel faster
• how is myelin sheath formed


  Schwann cells can produce up to 20 layers
• what are nodes of ranvier


  creates gaps in myelin sheath, allows impulse to travel faster across the gaps