Ch 3 Essay Question: 7) Cell Transport

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Carrier-mediated transport
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type of membrane transport; occurs by a carrier molecule flipping/changing its shape; can be ACTIVE or PASSIVE has 3 important characteristics: specificity saturation competition
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facilitated diffusion
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a type of passive carrier-mediated transport; unlike regular diffusion, requires a carrier molecule; a substance moves from a high-to-low concentration example: glucose is transported INTO cells
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active transport
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a type of active carrier-mediated transport; a substance moves from a low-to-high concentration; requires a carrier molecule and ATP; two kinds: PRIMARY and SECONDARY
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primary
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type of active transport; requires the direct use of ATP to drive a sodium-potassium pump
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secondary
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type of active transport; driven by a concentration gradient of ions established by primary active transport

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