I we go back to the finding of cells and their definition as a unit of life we can see that it has been fundamental for further biology development, as well as medicine and human anatomy. Understanding that cells make up tissues, and these in turn form organs, allows us to understand how the body works and how regulates itself, many homeostatic processes are given by cellular functions, as an example we can quote electrolyte balance which is no other than the quantity of water and salts we have in our systems if there is an excess or scarcity of water cells enter in sock.