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 number on the action potential graph represents the Depolarization phase?

Back

2

Front

In resting potential, which ion is more abundant on the outside of the neuron cell membrane?

Back

Na+ (Sodium)

Front

At what stages do Sodium/Potassium Channels open?

Back

Depolarization and Repolarization.

Front

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

Back

1 and 5.

Front

Define Action Potential.

Back

A rapid rise and fall in voltage or membrane potential across a cellular membrane.

Front

What is Resting Potential?

Back

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

Front

What role do Sodium ions (Na+) play during an action potential?

Back

They enter the neuron, causing depolarization.

Front

What is the role of Potassium ions (K+) during repolarization?

Back

They exit the neuron, restoring the negative internal charge.

Front

What is Hyperpolarization?

Back

An increase in the membrane potential of a cell, making it more negative than the resting potential.