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.
Water Balance: Sodium is one of the minerals that helps to regulate fluid levels in the human body. Sodium and water balance are closely linked. Sodium gateways and channels are what pump water into the cell and regulate the amount of extracellular fluid in the body.