Which ion pump moves Na+ out and K+ in?

Study for the Neurons, Nervous System, and Signal Transmission Test. Use detailed study guides and multiple choice questions with hints and explanations. Prepare effectively for your exam!

Multiple Choice

Which ion pump moves Na+ out and K+ in?

Explanation:
The concept being tested is how cells actively maintain ion gradients across the membrane. The sodium-potassium pump does this by using energy from ATP to move ions against their gradients: three sodium ions are pumped out of the cell and two potassium ions are pumped in with each cycle. This 3:2 exchange creates a net outward current, helping to keep the inside of the cell relatively negative and to regulate cell volume—both essential for resting membrane potential and proper neuronal signaling. The other pumps handle different ions and roles. Calcium pumps move Ca2+ out of the cytosol to terminate signaling and maintain low intracellular calcium. Proton pumps move H+ to create proton gradients used for processes like digestion or ATP production. Chloride-related transport affects Cl− gradients but does not perform the specific Na+/K+ exchange across the plasma membrane.

The concept being tested is how cells actively maintain ion gradients across the membrane. The sodium-potassium pump does this by using energy from ATP to move ions against their gradients: three sodium ions are pumped out of the cell and two potassium ions are pumped in with each cycle. This 3:2 exchange creates a net outward current, helping to keep the inside of the cell relatively negative and to regulate cell volume—both essential for resting membrane potential and proper neuronal signaling.

The other pumps handle different ions and roles. Calcium pumps move Ca2+ out of the cytosol to terminate signaling and maintain low intracellular calcium. Proton pumps move H+ to create proton gradients used for processes like digestion or ATP production. Chloride-related transport affects Cl− gradients but does not perform the specific Na+/K+ exchange across the plasma membrane.

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