The two fluids that constitute the extracellular fluid are Interstitial fluid and blood plasma constitute the extracellular fluid, which accounts for one-third of the total-body water.
Their relative proportion in body is 75-80% of ECF (11 L) and 20-25% of ECF (3 L) respectively.
The two fluids are almost identical in what they constitute except the presence of protein concentration and red blood cells in the plasma.
Plasma is the liquid portion of blood. About 55% of the blood in our body is plasma. Plasma is mostly water, around 92 percent of it consist of water.
Interstitial fluid refers to the fluids found in the spaces around cells, it is a result of the blood capillaries.
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