Section 5: Membrane Transport

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Last updated 8:28 PM on 9/21/26
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7 Terms

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Lipid Bilayer Permeability

Passes small/nonpolar molecules; blocks charged ions and large polar molecules

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Simple Diffusion

Passive movement down a concentration gradient without proteins

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Facilitated Diffusion

Passive movement down a gradient using channels or carriers

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Osmosis

Water diffusion across a membrane via aquaporin channels

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Primary Active Transport

Uses ATP directly to move solutes against gradient (e.g., Na+/K+ Pump)

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Na+/K+ Pump Ratio

Pumps 3 Na+ OUT of the cell and 2 K+ IN

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Secondary Active Transport

Uses an existing ion gradient to move another molecule against its gradient