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.
Kidney Functions. Regulation of body fluid osmolality & volume: Excretion of water and NaCl is regulated in conjunction with cardiovascular, endocrine, & central nervous systems. Regulation of electrolyte balance: Daily intake of inorganic ions (Na+, K+, Cl-, HCO3-, H+, Ca2+, Mg+ & PO43-)