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.
Major mineral and minor minerals are required by the body. The two major minerals. include Sodium: needed for muscle contraction, transmission of nerve impulses and body fluid. balance. Sodium can be obtained from many sources including table salt, milk, and vegetables.