Elements in the Human Body and What They Do
Elements in the Human Body and What They Do https://www.thoughtco.com/elements-in-the-human-body-4050823 byAnne Marie Helmenstine, Ph.D. Updated July 29, 2019Ninety-nine percent of the mass of the human body is made up of only six chemical elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Every organic molecule contains carbon. Since 65 to 90 percent of eac..