title: Analog computer simulation of active and passive Na flux in Necturus proximal tubule.
mesh_terms: D000818:Animals; D001692:Biological Transport; D001693:Biological Transport, Active; D003202:Computers, Analog; D007687:Kidney Tubules, Proximal / Q000502:physiology*; D008722:Methods; D008954:Models, Biological; D010539:Permeability; D012964:Sodium / Q000378:metabolism*; D013997:Time Factors; D014562:Caudata
chemical_list: D012964:Sodium