The Extracellular fluid reference article from the English Wikipedia on 24-Apr-2004
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Extracellular fluid

The two types of extracellular fluids are interstitial fluid and blood plasma.

In a human, the normal glucose concentration of extracellular fluid that is regulated by homeostasis is approximately 5 mM.

The pH of extracellular fluid is tightly regulated by buffers around 7.4.