-Your nerves are not joined up directly to each other
-There are junctions between them called SYNAPSES
-The electrical impulses travelling along your neurones have to cross these synapses but they cannot leap the gap
What would happen if someone touched a hot object;
-When they touch it a receptor in their skin is stimuated
-An electrical message passes along a sensory neurone to the CNS
-When a impulse from the sensory neurone arrives in the synapse with the relay neurone, a chemical message is released
-This crosses the synapse to the relay neurone and sets off an electrical impulse that travels along the relay neurone
-When the impulse reaches the synapse between the relay neurone and motor neurone returning to the arm, another chemical message is released
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