Lipids are effective barriers to some compounds SMALL HYDROPHOBIC CO2 MOLECULESN2 Hydrophobic compounds benzene can reach equilibrium UNCHARGED H20 POLAR glycerol quickIy MOLECULESethanol >"Unfavored"compounds UNCHARGED glucose can be brought across by MoLECuLes nucleotides. transport proteins H Na IONS HCO3, K Ca2+ Cl eea Tor Transport Mechanisms synthetic lipid bilay16 Lipids are effective barriers to some compounds ➢ Hydrophobic compounds can reach equilibrium quickly ➢ “Unfavored” compounds can be brought across by transport proteins Need for …..Transport Mechanisms