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How do substances get in and out of a cell? In this BrainPOP movie, Tim and Moby introduce you to the concept of active transport. Find out which substances can move through gaps in a cell membrane without requiring any effort from the cell. See examples of transport through a process called diffusion, and find out how cells can use their own energy and special proteins to move substances across their membrane. You’ll also discover the main source of cell energy, and how your white blood cells kill germs. Tim will really sell you on how cells work!