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.
Fluid balance can alter with disease and illness so it important to be aware of how much fluid is in the body, taking steps such as measuring urea and electrolytes levels. Gail P. Mooney, MSc, PG Social Research Methods, RGN, lecturer, School of Health Science, University of Wales, Swansea.