OBJECTIVES 1. � To define the following terms:differential permeability, passive andactive processes of transport,diffusion (simple diffusion, facilitated dif- fusion, and osmosis), solute pump, pinocytosis, and phagocytosis. 2. � To describe the processes that account for the movement of sub- stances across the plasma membrane, and to indicate the driving force for each. 3. � To determine which way substances will move passively through a dif- ferentially permeable membrane (given the appropriate information on concentration differences).