title: An unusual pattern of Na+ and K+ movements across the horse erythrocyte membrane.
abstract: Marked differences in the activities of three monovalent cation transport systems in horse versus human erythrocytes are reported. Whereas horse erythrocytes exhibit a 6-fold higher sodium-lithium countertransport, the unidirectional flux of potassium through the sodium pump is 3-4 times slower and the sodium-potassium cotransport system cannot be detected. In spite of this, horse and human cells are able to maintain similar Na+ and K+ gradients.
mesh_terms: D000818:Animals; D001693:Biological Transport, Active; D004910:Erythrocyte Membrane / Q000378:metabolism*; D006736:Horses; D007700:Kinetics; D008094:Lithium / Q000097:blood; D011188:Potassium / Q000097:blood*; D012964:Sodium / Q000097:blood*; D000254:Sodium-Potassium-Exchanging ATPase / Q000097:blood*
chemical_list: D008094:Lithium; D012964:Sodium; D000254:Sodium-Potassium-Exchanging ATPase; D011188:Potassium