Membranes and transport

The plasma membrane
Diffusion and osmosis
Passive transport
Active transport
Bulk transport
Unit test
10 questions

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About this unit
How do the cells in your body define their boundaries (and control what comes in or goes out)? As it turns out, cells have a sophisticated and flexible barrier, the plasma membrane, and a wide array of strategies for transporting molecules in and out. Learn more about what the membrane's made of and how different types of molecules move across it.