HI, here are different sources of information about nervous sytem, synapsis and brain. I hope you can learn more and get more abilities to the evaluation. Good luck!
1st: http://www.mind.ilstu.edu/curriculum/neurons_intro/neurons_intro.php
To review the sodium-potassium pump.
2nd: http://science.nationalgeographic.com/science/health-and-human-body/human-body/brain-article/
To review the brain structure.