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Membranes160-page7 - • Glucose • Many small ions •...

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Membrane Structure and Function - 7 Facilitated Diffusion Most molecules can not move freely through the membrane, but do cross membranes with the help of membrane transport proteins, which temporarily bind to the substance to be moved through the membrane, a process called facilitated diffusion or passive transport. No energy is involved, so it is still a passive process. Both carrier proteins and channel proteins are involved in facilitated diffusion. Materials that move through membranes by facilitated diffusion include:
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Unformatted text preview: • Glucose • Many small ions • Amino acids The movement of water through membranes also involves facilitated diffusion. There are special channel proteins, called aquaporins that facilitate the movement of water at a rate needed for cell activities. Now to a Complication of water, membranes and diffusion: Osmosis Before continuing our discussion of methods of moving materials across membranes, we need to discuss in more depth the impact of water movement through membranes on fluid balance in cells....
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