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, potassium and chloride are minerals that are called. âelectrolytes.â In the body, they work to maintain water balance. and provide the correct pressure between cells and their sur-. rounding fluids. Sodium and chloride are the major electrolytes. in the fluid that surrounds body cells.