Neuron is the word. You can also say 'nerve cell'
/ˈnjʊərəʊn/
It's a cell that carries messages between the brain and other parts of the body.
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brain
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neuron
This is a weblog for teachers, parents and students in 1st and 2nd level of Primary in our school. You can read it, write your comments, ask for pages… We hope it’s going to be useful for everyone.