title: A discussion on active transport of salts and water in living tissues. Introductory remarks.
mesh_terms: D000818:Animals; D001001:Anura; D001466:Barium Sulfate; D001693:Biological Transport, Active; D002462:Cell Membrane / Q000502:physiology*; D004058:Diffusion; D004847:Epithelial Cells; D004848:Epithelium / Q000502:physiology; D009994:Osmolar Concentration; D012964:Sodium; D014508:Urea
chemical_list: D001466:Barium Sulfate; D014508:Urea; D012964:Sodium