Movement across membranes
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Membrane animation
Short clip showing what happens when membrane is heated.
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Membrane structure and transport
Animations and multiple choice questions on membrane structure, osmosis and active transport.
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Osmosis and diffusion
Animated tutorial on osmosis and diffusion.
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Phagocytosis
Wikipedia page – includes several phagocytosis videos.
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Primary active transport
Animated tutorial on active transport.
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Sodium potassium pump
Lots of information here on structure and function of sodium potassium pump from “Molecule of the Month” site.