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

What happens when a membrane potential reaches +30 mV?

Back

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

Front

What number(s) on a graph typically represent the Resting Potential?

Back

1 and 5.

Front

Which number on a graph represents the Depolarization phase?

Back

2.

Front

What part of a neuron receives information from other neurons?

Back

Dendrites.

Front

Define Action Potential.

Back

A rapid rise and fall in membrane potential that occurs when a neuron sends a signal.

Front

What is Resting Potential?

Back

The electrical potential of a neuron when it is not actively sending a signal, typically around -70 mV.

Front

What role do sodium channels play during an action potential?

Back

They open to allow sodium ions to enter the neuron, causing depolarization.

Front

What is the function of potassium channels during repolarization?

Back

They open to allow potassium ions to exit the neuron, restoring the negative membrane potential.

Front

What is the refractory period?

Back

The time after an action potential during which a neuron cannot fire another action potential.