Urinary System-Countercurrent Multiplier

Countercurrent multiplier:

phenomena where high Na⁺ in the medulla acts to help remove H₂O in the descending loop

The movement of Na⁺ out of the ascending loop and into the medulla results in what?

H₂O loss and concentrated urine in the descending loop

The H₂O loss and increased Na⁺ concentration that occurs in the descending loop further enhances what?

the ability of the ascending loop to pump more Na⁺ out into the medulla

where does urea remain?

concentrated in the fluid for excretion