Nerve Impulses/Action Potential

Front

What is the threshold level of stimulus in a neuron?

Back

-55 mV is the threshold required to complete an action potential.

Front

What charge does a neuron have at rest?

Back

The inside of the neuron is negatively charged compared to the outside.

Front

What part of a neuron receives information from other neurons?

Back

Dendrites.

Front

What is hyperpolarization in the context of action potentials?

Back

Hyperpolarization is the phase where the membrane potential becomes more negative than the resting potential.

Front

What is the significance of -55 mV in action potentials?

Back

It is the threshold required to initiate an action potential.

Front

What is the role of the axon in a neuron?

Back

The axon transmits electrical impulses away from the neuron's cell body.

Front

What is the function of the myelin sheath?

Back

The myelin sheath insulates the axon and increases the speed of nerve impulse transmission.

Front

What occurs during depolarization?

Back

During depolarization, the membrane potential becomes less negative, moving towards zero.

Front

What is the all-or-nothing principle in action potentials?

Back

Once the threshold is reached, an action potential is triggered, and it will always be of the same magnitude.

Front

What happens during the repolarization phase?

Back

During repolarization, potassium ions exit the neuron, restoring the negative charge inside.