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An adult human is 60 percent water; a third of this water is in extracellular fluid, and 20 percent of extracellular fluid is in the blood. If a person weighs 200 pounds, the weight of the interstitial fluid bathing that person's cells weighs approximately _______ pounds.

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MechEngineer

Answer:

32 pounds

Explanation:

The amount of water in the 200 pound person is

200 * 60% = 200*0.6 = 120 pounds

Of the 120 pounds, a third of this is extracellular fluid, the amount of extracellular fluid is

120 / 3 = 40 pounds

20 % of this is in the blood, which amounts to

40 * 20% = 40 * 0.2 = 8 pounds

The rest is interstitial fluid, which is

40 - 8 = 32 pounds

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