<prompt> Which factor does not affect the diffusion of substance through the cell membrane?Molecular size of the substanceLipid solubility of the membraneATP generating capacity on both sides of membraneDistribution of channels for the substance in the membrane  <response>: Diffusion occur without the expenditure of energy. It depend on the concentration of molecules. REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, PAGE NO - 4 