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UNIT C • CHAPTER 8 LESSON 1 Passive Transport Passive/Active Transport 15 Active Transport Molecules Cell membrane 2 3 Vesicle Cells expend no energy in passive transport. Substances diffuse across the cell membrane from regions of high concentration to regions of low concentration. Cells must expend energy to move materials across the cell membrane from regions of low concentration to regions of high concentration. Forming vesicles is one way this is done. Teaching Transparencies Copyright © Houghton Mifflin Company. All rights reserved. 1 5_973057_15.indd 1 4/12/07 7:10:06 PM