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→Fluid balance, normal quantity of water and other elements
About 80% of the ECF is interstitial fluid, which occupies the microscopic spaces between tissue cells, and 20% of the ECF is plasma, the liquid portion of the blood. Other extracellular fluids that are grouped with interstitial fluid include lymph in lymphatic vessels; cerebrospinal fluid in the nervous system; synovial fluid in joints; aqueous humor and vitreous body in the eyes; endolymph and perilymph in the ears; and pleural, pericardial, and peritoneal fluids between serous membranes. The body is in fluid balance when the required amounts of water and solutes are present and are correctly proportioned among the various compartments. Water is by far the largest single component of the body, making up 45–75% of total body mass, depending on age and gender.
About 80% of the ECF is interstitial fluid, which occupies the microscopic spaces between tissue cells, and 20% of the ECF is plasma, the liquid portion of the blood. Other extracellular fluids that are grouped with interstitial fluid include lymph in lymphatic vessels; cerebrospinal fluid in the nervous system; synovial fluid in joints; aqueous humor and vitreous body in the eyes; endolymph and perilymph in the ears; and pleural, pericardial, and peritoneal fluids between serous membranes. The body is in fluid balance when the required amounts of water and solutes are present and are correctly proportioned among the various compartments. Water is by far the largest single component of the body, making up 45–75% of total body mass, depending on age and gender.
It may be noted that ''udaka'' has been mentioned to be present in quantity of ten ''anjali'' and this quantity is irrespective of ''rasa'' which is nine ''anjali'' in quantity and ''rakta'' is eight ''anjali'' in quantity. But this ''udaka'' acts as a replacement for ''rakta'' and ''rasa'' as and when necessary. ''Sweda, lasika, kapha'', etc. are also ''jaliya'' (watery) entity which are closely related with ''udaka''.
It may be noted that ''udaka'' has been mentioned to be present in quantity of ten ''anjali'' and this quantity is irrespective of ''rasa'' which is nine ''anjali'' in quantity and ''rakta'' is eight ''anjali'' in quantity. But this ''udaka'' acts as a replacement for [[rakta]] and [[rasa dhatu]] as and when necessary. ''Sweda, lasika, [[kapha]], etc. are also ''jaliya'' (watery) entity which are closely related with ''udaka''.
=== Mechanisms of fluid balance ===
=== Mechanisms of fluid balance ===