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.
can be regulated by altering sodium intake or excretion by the kidney. However, intake is dependent on dietary preferences and usually is excessive because of the abundant salt content of most foods. There-fore, regulation of sodium balance is achieved primarily by altering urinary sodium excretion. It is therefore of major significance that,