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.
Like most processes in the body, water balance is regulated by hormones. These chemical messengers help control how much water is retained or removed from the body. In fact, your endocrine system, your nervous system, and your urinary system work together to signal thirst and to effectively manage a water shortage.