There are different elements that can be found in the human body that can be used in order to create various chemicals. The most abundant element that can be found is oxygen. This is not a surprise especially since oxygen is being used by people in order to breathe and survive.
It is through oxygen that the different body parts are expected to live. About 65% of the human body relies on oxygen. There are still other elements that can contribute to the production of various chemicals such as carbon, hydrogen, nitrogen, sulfur, and phosphorus.
Take note that there are still other components that you can find such as potassium and calcium.