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.
The difference in electrolyte levels creates and maintains these electrical voltages. The levels of electrolytes in the body's fluid compartments are controlled by the movement of electrolytes into or out of those compartments. The kidneys filter electrolytes from the blood and work to keep their levels in the blood constant. Hormones (like antidiuretic hormone, aldosterone and parathyroid hormone) also help regulate electrolyte balance. Â­The body has to perform delicate balancing acts to keep water and electrolyte levels just right.