Action Potentials

Front

What is the resting potential of a neuron?

Back

-70 mV

Front

What does the term 'Resting Potential' refer to in neurons?

Back

The electrical charge difference across the neuronal membrane when the neuron is not actively transmitting signals.

Front

What ion is more concentrated outside of a neuron at resting potential?

Back

Na+ (Sodium)

Front

What is the role of dendrites in a neuron?

Back

Dendrites receive signals from other neurons and transmit them to the cell body.

Front

What is the function of the axon in a neuron?

Back

The axon transmits electrical impulses away from the cell body to other neurons or muscles.

Front

What is the significance of the myelin sheath?

Back

The myelin sheath insulates the axon and increases the speed of electrical signal transmission.

Front

What is an action potential?

Back

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

Front

What happens during depolarization in a neuron?

Back

The membrane potential becomes less negative (more positive) as Na+ ions enter the cell.

Front

What is the threshold potential for initiating an action potential?

Back

Typically around -55 mV.

Front

What occurs during repolarization?

Back

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