What fraction of total body water is extracellular fluid?

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Multiple Choice

What fraction of total body water is extracellular fluid?

Explanation:
The amount of total body water that lies outside cells is about one third. In adults, total body water is roughly 60% of body weight, and about two-thirds of that TBW is inside cells (intracellular fluid), leaving about one-third outside the cells as extracellular fluid. So, extracellular fluid is about 1/3 of TBW (for a typical 70 kg adult, TBW ≈ 42 L and ECF ≈ 14 L). Within the extracellular fluid, plasma makes up about a quarter and interstitial fluid about three-quarters.

The amount of total body water that lies outside cells is about one third. In adults, total body water is roughly 60% of body weight, and about two-thirds of that TBW is inside cells (intracellular fluid), leaving about one-third outside the cells as extracellular fluid. So, extracellular fluid is about 1/3 of TBW (for a typical 70 kg adult, TBW ≈ 42 L and ECF ≈ 14 L). Within the extracellular fluid, plasma makes up about a quarter and interstitial fluid about three-quarters.

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