Biology / Bio 0364 · Atom · ~20 seconds
Primary and Secondary Active Transport
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Primary active transport uses ATP directly against a gradient; secondary active transport spends no ATP, drawing on a gradient a primary pump built.
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Sodium's gradient, built by the sodium-potassium pump's ATP use, powers glucose's secondary transport at no added cost.
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Secondary transport still moves a substance against its gradient — it borrows energy another pump paid for.