The lower boundary of the exosphere is called the exobase. It is also called exopause and 'critical altitude' as this is the altitude where barometric conditions no longer apply. Atmospheric temperature becomes nearly a constant above this altitude.
Sodium â the volatility and solvent mineral: essential to life, all body fluids contain sodium â itâs needed for many biochemical processes including water balance regulation, fluid distribution on either side of the cell walls, muscle contraction and expansion, nerve stimulation and acid-alkaline balance.
Sodium and other minerals regulate the amount of water in the body's cells. Calcium is necessary for blood clotting. Other minerals that are important to the human body include chlorine, cobalt, fluorine, iodine, magnesium, manganese, tin, and zinc.