9. What Are Ion Pumps?

Key Question

If ions keep moving through channels, how do neurons maintain their concentration gradients?

What You’ll Learn

• What ion pumps are
• How pumps differ from ion channels
• Why active transport requires energy
• How ATP powers ion transport
• What the sodium-potassium pump does
• Why ion gradients must be continuously maintained

Key Takeaway

Ion channels allow ions to move according to existing electrochemical gradients.

Ion pumps use energy to maintain those gradients.

Without those maintained differences, neurons would eventually lose the conditions required for electrical signalling.

Module Takeaway

Neural signalling depends on a coordinated system:

ion gradients → membrane potential → action potentials → propagation → synaptic transmission

Channels allow ions to move.

Pumps maintain the gradients that make that movement meaningful.