Joan -- your multiple questions with no attempt to answer them show me that you're just dumping your homework problems on us.
We'll be glad to help you if tell us what you have found. We're a homework Help forum, not a homework Do forum.
describe briefly how the particular structure of a neuron relates to it's function in the body
2 answers
http://normandy.sandhills.cc.nc.us/psy150/neuron.html