Outside cellsoutside tissue cells

Now, let's take the time to get all this straight! Remember from Chapter 4 that the extracellular fluid (ECF) is the total amount of salty water (saline solution) located outside of all our body cells. We are now, therefore, clarifying the notion of the ECF by subdividing it into two major types of fluids -the interstitial fluid plus the plasma (PLAZ-mah). Plasma is the watery portion of the ECF present between the individual blood cells, within the bloodstream (see Figure 5.7).

In overview:

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