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NEURONS (NERVE CELLS) (STRUCTURES (cell body (controls metabolism of nerve…

- - - - one axon and multiple dendrites extending from cell body
        eg. interneurons and motor neurons
    - - one axon and one dendrite
        eg. inter
    - - just one axon with cell body to side of axon
        eg. sensory
  - - - carry messages between motor and sensory neurons
    - - carry messages away from CNS to effectors (muscles and glands) [efferent]
    - - carry messages from receptors to CNS [afferent]
- - - - vesicles move to end bulb membrane
        
        neurotransmitters are released into synaptic cleft
        
        neurotransmitters diffuse across cleft
        
        neurotransmitters bind to receptor sites on membrane of the dendrites of the next neuron
        
        binding on causes depolarisation of the next neuron's axon and the impulse travels on
        
        enzymes break down neurotransmitter after impulse has been transferred