Here's a link to all the websites used to understand the topic. All images are my own creation. 
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​https://www.verywellmind.com/what-is-an-action-potential-2794811
​https://www.verywellmind.com/what-is-a-neuron-2794890
https://www.newsweek.com/china-south-china-sea-islands-build-military-territory-expand-575161
​https://www.engineeringtoolbox.com/specific-heat-capacity-d_391.html
Fishbane, Paul M., et al. Physics for Scientists and Engineers. Pearson Prentice Hall, 2005.