The presence of Na-Na and Na-K exchange in sodium extrusion by three species of fish.
D000818:Animals; D001693:Biological Transport, Active; D005399:Fishes / Q000097:blood / Q000378:metabolism*; D008564:Membrane Potentials; D011188:Potassium / Q000097:blood / Q000378:metabolism*; D012623:Seawater; D012964:Sodium / Q000097:blood / Q000378:metabolism*
D012964:Sodium; D011188:Potassium