Inorganic compounds referred to as inorganic, refers to the organic matter (carbon skeleton of the material) of all elements and their compounds, such as water, such as air.
Salt, sulfuric acid, carbon monoxide, carbon dioxide, carbonates, cyanide, etc. are also inorganic. The vast majority of inorganic matter can be classified into oxides, acids, alkalis and salts. The inorganic matter in the organism is mainly water and some inorganic ions such as Na +, K +, Ca2 +, Mg2 +, Cl-, HCO-3, SO42-, HPO42- and so on. See "Bio-Elements". The human body contains almost all kinds of elements in nature, in which carbon, hydrogen, oxygen and nitrogen are mainly in the form of organic compounds, the rest are collectively referred to as inorganic (mineral or ash).
Therefore, the inorganic matter is mainly composed of: water and inorganic salts, which can be classified as water: water and free water, combined with water is an important component of cell structure, free water is a good solvent, transport substances, reaction. Inorganic salts can be divided into: ions and compounds, ions are to maintain normal cell life activities, the compound is an important component of intracellular compounds.