Interstitial fluid

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The fluid found in the intercellular spaces composed of water, amino acids, sugars, fatty acids, coenzymes, hormones, neurotransmitters, salts, and cellular products. It bathes and surrounds the cells of the body, and provides a means of delivering materials to the cells, intercellular communication, and removal of metabolic waste [1].

On average, a person has about 11 litres (2.4 imperial gallons) of interstitial fluid, providing the cells of the body with nutrients and a means of waste removal [2].

From Ref. 2