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.
alyfromuk2us/RooM/Getty Images. Potassium is a major dietary mineral that helps balance your body's pH and body fluids. It's important for normal blood pressure regulation (it works in opposition to sodium). It's also needed for normal muscle growth, and for nervous system and brain function.