neurons part 2 - functions

• what is the function of a axon in a neuron


  extension of the cytoplasm that transmits impulses away from the cell body to axon endings
• what is the function of dendrites


  many thin extensions of cytoplasm that receive impulses from other nerve cells that transmit impulses towards the cell body
• what is found in the cell body of a neurone

  the nucleus and groups of ribosomes
• what is synthesised in the cell body of a neurone

  neurotransmitters
• what is the synaptic end bulb


  swelling at the end of the neuron
• what is the axon ending function


  the secretion of neurotransmitters by exocytosis into the synaptic cleft
• what are nissl granules


  these contains ribosomes which form neurotransmitters
• what is the function of Schwann cells

  these surround peripheral neurones in vertebrates and grow around the axon to form a multi layered myelin sheath
• what is the function of myelin sheath


  these form Schwann cells which provide electrical insulation to speed up the transmission of impulse transmission
• what is the function of nodes of ranvier


  these are intervals between the myelin sheath