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Redo as wikitable the image at File:201 Elements of the Human Body-01.jpg

Element Symbol Percentage in Body
Oxygen O 65.0
Carbon C 18.5
Hydrogen H 9.5
Nitrogen N 3.2
Calcium Ca 1.5
Phosphorus P 1.0
Potassium K 0.4
Sulphur S 0.3
Sodium Na 0.2
Chlorine Cl 0.2
Magnesium Mg 0.1
Trace elements include boron (B), chromium (Cr), cobalt, (Co), copper (Cu), flourine (F), iodine (I), iron (Fe), manganese (Mn), molybdenum (Mo), selenium (Se), silicon (Si), tin (Sn), vanadium (V), and zinc (Zn). less than 1.0
Elements of the human body by mass. Trace elements are less than 1% combined (and each less than 0.1%).

The human body is composed of elements including hydrogen, oxygen, carbon, calcium and phosphorus.[1] These elements reside in trillions of cells and non-cellular components of the body.

The adult male body is about 60% water for a total water content of some 42 litres. This is made up of about 19 litres of extracellular fluid including about 3.2 litres of blood plasma and about 8.4 litres of interstitial fluid, and about 23 litres of fluid inside cells.[2] The content, acidity and composition of the water inside and outside cells is carefully maintained. The main electrolytes in body water outside cells are sodium and chloride, whereas within cells it is potassium and other phosphates.[3]