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Nerves and the nervous system

What are nerves? Why are they necessary?

http://www.regentsprep.org/regents/biology/2011%20Web%20Pages/Human%20Body-%20Nervous%20System-Drugs%20page.htm

http://www.edusolution.com/edusolution2/livinenviron/june2004/page8.htm

http://www.regentsprep.org/regents/biology/units/organization/communication.cfm

http://www.edusolution.com/edusolution2/livinenviron/june2002/page13.htm

http://www.biology4kids.com/files/systems_nervous.html

Most cells are small – microscopic. But not all – nerve cells need to be long. How long?

How does one nerve send a signal to another nerve? (snapse)

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