text: There are so many its hard to start. The most important would be (and this is only an opinion) :\n\nEnzyme based reactions\n\nOxidation reactions (burning your food to make energy)\n\nOxygenation of the blood\n\nNerve impulse tranfer chemisty\n\nProtein synthesis reactions\n\nCell growth mechanisms\n\nControl of blood sugar\n\nToxin metabolism and control\n\nThere are an awful lot of these, i could go on and on : the body needs pretty much all of its chemistry. Tough question.