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Published on 09 Feb 2010 | over 7 years ago

Learn about diffusion, osmosis, and concentration gradients and why these are important to cells.

Watch the next lesson: www.khanacademy.org/science/biology/membranes-and-transport/passive-transport/v/passive-transport-and-selective-permeability

Missed the previous lesson? www.khanacademy.org/science/biology/membranes-and-transport/diffusion-and-osmosis/v/hypotonic-isotonic-and-hypertonic-solutions-tonicity

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