Organisms clearly owe their origin, metabolism, and many other internal functions to chemical phenomena, especially the chemistry of large organic molecules.
They can also regulate internal functions of our body including, but not limited to, osmotic pressure in cells, blood pressure in veins and arteries, micturition, and heart contractility.
As well, a large variety of internal functions (commands) are available and ready to assign to icons, although some study might be needed to discover them.