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.
Minerals are essential for structuring iron's relationship to the blood cell's, cobalt's relationship to B12, and sodium and potassium controlling body fluids. Minerals are categorized into two groups: The major minerals which are present in large amounts, and trace minerals which are present in smaller amounts.