2. Passive transport and active transport A. Comparison of two classes of transport. Table 8-2 Properties of Passive and Active Transport Diffusion(Passive Transport Properties Simple Diffusion Facilitated Diffusion Active Transport Solutes transported Examples Small nonpolar Ox Yes Large nonpolar Fatty acids Yes No Small polar No Large polar GI ucose N Ye lo N+K+ Ca No Yes Thermodynamic properties Direction relative to electrochemical gradient Down Effect on entropy Increased Increased Decreased Metabolic energy required N Intrinsic directionality N Kinetic properties Carrier-mediated Yes Yes ipump Michaelis- Menten kinetics N Yes Competitive inhibition N Yes Yes2. Passive transport and active transport A. Comparison of two classes of transport