countercurrent exchanger

countercurrent exchanger
A system in which heat or chemicals passively diffuse across a membrane separating two c. streams so that at each end the fluid leaving along one side of the membrane nearly resembles, in temperature or composition, the fluid entering the other; e.g., the venae comites in the arms serve as a c. exchanger, the arterial blood serving to rewarm the cooler venous blood.

Medical dictionary. 2011.

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