All body fluids other than that contained within cells; includes plasma and interstitial fluid.

extra-, outside + cell] (n) the fluid, from the general circulation, which surrounds each cell in the body and from which the cells obtain their nutrients and expell their waste products. (Compare with intracellular fluid, the fluid that is found inside the cell.)

( ECF) The fluid outside the plasma membrane of cells, including interstitial fluid and blood plasma.

The medium through which energy flows when the body uses and exchanges energy with a chemical action of the metabolites in the circulatory system.