types transport across membranes membrane |
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| navigate by keyword : across active anatomy bilayer biology cell cytoplasm diagram diffusion energy glucose health human illustration insulin intracellular isolated medical medicine membrane metabolism molecule organ osmosis oxygen passive phospholipid plasma protein science structure surface transport types |
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| Basic types of membrane transport, simple passive diffusion, facilitated diffusion by channels and carriers, and active transport. Even simple passive diffusion requires energy to cross a bilayer membrane. |
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