Countercurrent multiplication by the thin loops of Henle.
D000818:Animals; D001693:Biological Transport, Active; D001774:Blood Chemical Analysis; D007668:Kidney / Q000502:physiology*; D007684:Kidney Tubules / Q000502:physiology*; D008297:Male; D011188:Potassium / Q000032:analysis; D051381:Rats; D012964:Sodium / Q000032:analysis; D012965:Sodium Chloride / Q000032:analysis
D012965:Sodium Chloride; D012964:Sodium; D011188:Potassium