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What percentage of extracellular fluid is composed of fluid in the blood?

User Dimitris
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Final answer:

Approximately 25% of the extracellular fluid is composed of fluid in the blood.

Step-by-step explanation:

Extracellular Fluid Composition



The extracellular fluid (ECF) is composed of fluid in the blood and interstitial fluid. It represents about 20% of the body weight. Out of this, 5% of the ECF is in blood plasma. The remaining 15% is in the interstitial fluid, which surrounds cells that are not blood cells. In comparison, intracellular fluid makes up about 50% of the body weight in lean individuals.

Therefore, approximately 25% of the extracellular fluid is composed of fluid in the blood.

User Kevin TeslaCoil
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