Membrane transport proteins
Why?
Channel and carrier proteins let specific ions and molecules cross the membrane, by facilitated diffusion or pumping with ATP.
Glucose binds a carrier protein that flips shape and drops it inside the cell, like a revolving door.
Press the button to move glucose and ions across the membrane with proteins.
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The sodium-potassium pump uses one ATP to push three sodium ions out and bring two potassium ions in.
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