Question

our body produces heat does the electric current produce from our nervous system produce heat. i think it does,well if it does is it possible like thermal imaging a machine or whatever be made up sensitive enough to see all the neurons firing within our nervous system?

Answer 1

It is used already.
http://www.currentprotocols.com/WileyCDA/CPUnit/refId-ns0617.html
but take in your mind uncertainty principle.

Answer 2

Actually the heat is the result of the metabolic processes carried out in the body. The complex chemical reactions give off heat. This heat is the result of the oxidation of food in digestion and the nutrients that are absorbed into the cells. Energy is also released when the muscles are used.