identify three kinds of nerons that are found in the nervos system?describe how they interact to carry nreve impulse?

One categorization is afferent (sensory), efferent (motor) and internuerons (those that connect other neurons).

I searched Google under the key words "unsaturated alkenes" to get these possible sources:

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/N/Neurons.html
http://www.howstuffworks.com/brain2.htm
http://www.enchantedlearning.com/subjects/anatomy/brain/Neuron.shtml

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.