Constant element

Macroelements refer to elements in the body that account for more than 0.01% of body weight. Such elements account for a large proportion in the body and the organism needs more. Is an essential element of the organism. The elemental composition of a standard healthy adult is 65% oxygen, 18% carbon, 10% hydrogen, 3% nitrogen, 1.5% calcium, 1% phosphorus, 0.35% potassium, 0.25% sulfur, 0.15% sodium, 0.15% chlorine, and 0.05% magnesium Etc. These constant elements account for approximately 99.9% of body weight.