Neural Anatomy and Action Potential

Front

What is the significance of -55 mV in neural anatomy?

Back

It is the threshold required to complete an action potential.

Front

Which numbers on a graph typically represent the Resting Potential?

Back

1 and 5.

Front

What happens when a membrane potential reaches +30mV?

Back

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

Front

At what stage do Potassium ions end outside the neuron and Sodium ions end inside the neuron?

Back

Repolarization.

Front

What is the role of the Na+/K+ ATPase pump in maintaining resting membrane potential?

Back

It moves 3Na+ out for every 2K+ in.

Front

Define Resting Potential in neurons.

Back

The electrical potential difference across the membrane of a neuron at rest, typically around -70 mV.

Front

What is Depolarization in the context of action potentials?

Back

The process where the membrane potential becomes less negative (more positive) due to the influx of sodium ions.

Front

What occurs during Repolarization?

Back

The membrane potential returns to a more negative value as potassium ions exit the cell.

Front

What is Hyperpolarization?

Back

A state where the membrane potential becomes more negative than the resting potential.

Front

Explain the role of Sodium (Na+) ions during an action potential.

Back

Sodium ions rush into the neuron, causing depolarization.