noun, plural: tissue fluids
It consists of amino acids, sugars, fatty acids, coenzymes, hormones, neurotransmitters, salts, and waste materials from cells. However, its composition varies depending upon the exchanges between cells (of a tissue) and the blood. Physiologically, it functions in the interstitial transport of materials (e.g. nutrients) to the cells, intercellular communication, and removal of metabolic waste.