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.
Mineralocorticoids. Mineralocorticoids are hormones that help regulate the salt and water balance in the body. The two important salt ions that are involved in this regulation are sodium and potassium. As we often see in biochemistry, where sodium goes, water follows.