Understanding the structure of a cell membrane—the phospholipid bilayer—and how molecules cross the membrane by diffusion can be a hard concept to visualize from 2-D diagrams alone. Here are a few links to videos we watched in class on Monday and Tuesday that help students visualize this process:
Selectively Permiable: Iodine & Starch Packet Video
Cell Membrane Video
Passive Transport/Diffusion through Cell Membrane Video
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