What type of transfer protein is the Na+/K+ pump and how does it use energy?

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Multiple Choice

What type of transfer protein is the Na+/K+ pump and how does it use energy?

The Na+/K+ pump is a primary active transporter, using energy directly from ATP hydrolysis to move ions against their gradients. It functions as an antiporter, moving Na+ out of the cell while bringing K+ in, in opposite directions. This energy comes from ATP, not from any existing ion gradient, so it’s not secondary active transport. The pump’s cycle involves phosphorylation by the ATPase, which triggers conformational changes that release Na+ outside and then bind K+ inside before returning to the original state. This 3 Na+ out / 2 K+ in operation helps maintain the membrane potential and cell volume.

The Na+/K+ pump is a primary active transporter, using energy directly from ATP hydrolysis to move ions against their gradients. It functions as an antiporter, moving Na+ out of the cell while bringing K+ in, in opposite directions. This energy comes from ATP, not from any existing ion gradient, so it’s not secondary active transport. The pump’s cycle involves phosphorylation by the ATPase, which triggers conformational changes that release Na+ outside and then bind K+ inside before returning to the original state. This 3 Na+ out / 2 K+ in operation helps maintain the membrane potential and cell volume.

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