I.Membrane transport of small molecules Type Example Transmembrane Speed Reason Nonpolar O2,C02,N2, Fast Soluble in the lipid molecules benzene bilayer Small and H2O,Urea Modest Uncharged polar uncharged small molecules Glycerin Slow large Uncharged polar Glucose, large molecules Sucrose Hardly larger H+,K+,Na*,HCO3 lons Ca2+,CF,Mg2+ Impermeable Charged This document is produced by trial version of Print2Flash.Visit www.print2flash.com for more information