countercurrent

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countercurrent

 [kown´ter-ker″ent]
flowing in an opposite direction.

count·er·cur·rent

(kown'ter-ker'ent),
1. Flowing in an opposite direction.
2. A current flowing in a direction opposite to another current.

countercurrent

/coun·ter·cur·rent/ (-kur″ent) flowing in an opposite direction.

countercurrent

a change in the direction of flow of a fluid. An example is the countercurrent in the ascending branch of a kidney tubule where osmolality undergoes a reversal after a gradual change in sodium chloride concentrations.

countercurrent

flowing in an opposite direction.

countercurrent exchanger
a countercurrent system in which transport between the inflow and the outflow is passive.
countercurrent multiplier
a mechanism that enables a membrane to absorb much more solute than water so that the residual fluid has a lower osmotic pressure. The classical example of this phenomenon is the loop of Henle in the kidney. Called also countercurrent multiplier mechanism or system.
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