Neurones

• Cell body

  Control centre of the neurone = impulse carried away from cell body to axon
• nucleus

  contains genetic information
• dendrites

  receive and carry impulses from neighbouring neurones
• axon

  Carries electrical impulses away from cell body and down the neurone
• myelin sheath

  insulates the axon, which in turn, speeds up the nerve impulses.
• axon terminal buttons

  where the electrical impulse terminates and changes from electrical to chemical
• sensory structure + function

  long dendrites, short axons = carries impulse from sensory to CNS
• motor structure and function

  short dendrites, long axons = carries impulses from CNS to the muscle
• relay structure and function

  short axons and short dendrites = passes between sensory and motor neurones
• how do electrical impulses occur

  rest = negatively charged

  activated = positively charged = an action potential which creates an electrical impulse that travels down axon to next neurone.