Neural Anatomy and Action Potential

Front

What is the correct order of events in depolarization and repolarization?

Back

Sodium channels open, potassium channels open.

Front

What part of a neuron receives information from other neurons?

Back

Dendrites.

Front

When a membrane potential reaches +30mV, which channels open, what occurs, and which channels close?

Back

Potassium channels open, repolarization occurs, sodium channels close.

Front

What number on a graph typically represents the depolarization phase?

Back

2.

Front

Which pump is involved in maintaining a resting membrane potential?

Back

Na+/K+ ATPase pump moves 3Na+ out for every 2K+ in.

Front

Define depolarization in the context of action potentials.

Back

Depolarization is the process where the membrane potential becomes more positive, typically due to the influx of sodium ions.

Front

What is repolarization?

Back

Repolarization is the return of the membrane potential to a more negative value after depolarization, primarily due to the efflux of potassium ions.

Front

What role do sodium channels play during an action potential?

Back

Sodium channels open to allow Na+ ions to enter the neuron, causing depolarization.

Front

What is the function of potassium channels during an action potential?

Back

Potassium channels open to allow K+ ions to exit the neuron, leading to repolarization.

Front

Explain the significance of the Na+/K+ ATPase pump.

Back

The Na+/K+ ATPase pump maintains the resting membrane potential by moving 3 Na+ ions out and 2 K+ ions into the cell.