010 Repolarization: Phase 2 of the Action Potential

Leslie Samuel explains the second phase of the action potential, repolarization. He emphasizes the importance of understanding the first phase, depolarization, where sodium ions rush into the cell, making the membrane potential more positive. The video then introduces potassium ions, which have a positive charge and are abundant inside the cell. When the membrane potential becomes sufficiently positive, voltage-gated potassium channels open, allowing potassium ions to exit the cell. This outflow makes the membrane potential more negative, a process known as repolarization. Leslie encourages viewers to ask questions and promises to address them in future videos.

Explain the sequence of events that lead to the opening of voltage-gated potassium channels.

How does the equilibrium potential for potassium influence its movement during repolarization?

Describe the role of potassium ions during the repolarization phase.

What is repolarization in the context of action potential?

What happens to the membrane potential during repolarization?