Tissue fluid - A watery liquid that contains glucose, amino acids, fatty acids, ions and oxygen which bathes the tissues
Tissue fluid supplies all of its substances to the tissues
In return, it receives carbon dioxide and other waste materials from the tissues
Therefore is the means by which materials are exchanged between blood and cells
Tissue fluid is formed by blood plasma (carrying dissolved substances) leaking from the capillaries
Although capillaries are small, they cannot serve every single cell directly. Therefore the final journey of metabolic materials is made in a liquid solution that bathes the tissues. This liquid is called tissue fluid