countercurrent

(noun)

a current that flows against the prevailing one

Related Terms

Examples of countercurrent in the following topics:

  • Kidney Function and Physiology

    • Because two sides of the loop of Henle perform opposing functions, it acts as a countercurrent multiplier .
    • The vasa recta around the loop of Henle acts as the countercurrent exchanger.
    • The loop of Henle acts as a countercurrent multiplier that uses energy to create concentration gradients.

  • Nephron: The Functional Unit of the Kidney

    • As urine travels down the collecting duct system, it passes by the medullary interstitium, which has a high sodium concentration as a result of the loop of Henle's countercurrent multiplier system.

  • Heat Conservation and Dissipation

    • This is called a countercurrent heat exchange; it prevents the cold venous blood from cooling the heart and other internal organs.

  • Nitrogenous Waste in Terrestrial Animals: The Urea Cycle

    • In humans, apart from being a carrier of waste nitrogen, urea also plays a role in the countercurrent exchange system of the nephrons, which allows for re-absorption of water and critical ions from the excreted urine.