<P> The extracellular fluid , in particular the interstitial fluid , constitutes the body 's internal environment that bathes all of the cells in the body . The ECF composition is therefore crucial for their normal functions , and is maintained by a number of homeostatic mechanisms involving negative feedback . Homeostasis regulates , among others , the pH , sodium , potassium , and calcium concentrations in the ECF . The volume of body fluid , blood glucose , oxygen , and carbon dioxide levels are also tightly homeostatically maintained . </P>
where do you find interstitial fluid in the human body
bathes all of the cells in the body