Facilitated Diffusion and Active Transport

source: http://www.youtube.com/watch?v=1ZFqOvxXg9M&feature=related

This video goes more into depth and talks more about pincytosis, phagocytosis, endocytosis, exocytosis, receptors and concentration gradient.


Read more with visuals:Movement Across Membranes a PDF file. Talks more about Osmosis, Diffusion and Active Transport.

This video gets more on the sientific techinical side, however, it's a great way to understand more on why diffusion happens.

source: http://www.youtube.com/watch?v=3bpfjJeKvvk

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