title: Transport across epithelia: some basic principles.
mesh_terms: D000818:Animals; D001692:Biological Transport; D001693:Biological Transport, Active; D002463:Cell Membrane Permeability; D004058:Diffusion; D004848:Epithelium / Q000378:metabolism* / Q000502:physiology; D006801:Humans; D006874:Hydrostatic Pressure; D007413:Intestinal Mucosa / Q000502:physiology; D007687:Kidney Tubules, Proximal / Q000502:physiology; D008433:Mathematics; D008564:Membrane Potentials; D009994:Osmolar Concentration; D013816:Thermodynamics