Unit 32 Action Potential

Front

What is the normal resting potential of a neuron cell membrane?

Back

-70mV

Front

When is the potassium channel open?

Back

During repolarization only

Front

Which ions are involved in an action potential?

Back

Sodium (Na) and Potassium (K)

Front

What process does the sodium potassium pump use to restore the resting potential?

Back

Active transport

Front

When a membrane potential reaches the peak positive charge, which channels open, what occurs, and which channels close?

Back

Potassium channels open, repolarization occurs, and sodium channels close.

Front

Define action potential.

Back

A rapid change in membrane potential that occurs when a neuron sends a signal.

Front

What is depolarization?

Back

The process by which the membrane potential becomes more positive than the resting potential.

Front

What role do sodium ions (Na+) play in action potential?

Back

They enter the neuron during depolarization, causing the membrane potential to rise.

Front

What is repolarization?

Back

The process of returning the membrane potential to its resting state after depolarization.

Front

What is the function of the sodium-potassium pump?

Back

To maintain the resting potential by moving Na+ out and K+ into the cell.