Unit 32 Signaling within Neurons

Front

What is the Depolarization phase in neuron signaling?

Back

The Depolarization phase is when the neuron's membrane potential becomes less negative (more positive) due to the influx of Na+ ions, leading to the generation of an action potential.

Front

What is Resting Potential in neurons?

Back

Resting Potential is the state of a neuron when it is not actively transmitting a signal, characterized by a negative charge inside the axon, typically around -70mV.

Front

What occurs at step #4 in the action potential process?

Back

At step #4, K+ (potassium) channels open, allowing K+ to diffuse out of the neuron, which repolarizes the membrane after depolarization.

Front

Describe the pathway of action potentials in neurons.

Back

Action potentials run along the axon from the axon hillock to the axon terminals, transmitting signals to other neurons or muscles.

Front

What charge does the inside of a resting neuron have?

Back

The inside of a resting neuron has a negative charge.

Front

What is the role of Na+ ions during depolarization?

Back

Na+ ions rush into the neuron during depolarization, causing the membrane potential to become more positive.

Front

What is the significance of the threshold potential?

Back

The threshold potential is the critical level to which a membrane must be depolarized to initiate an action potential.

Front

What happens during repolarization of a neuron?

Back

During repolarization, K+ channels open, allowing K+ to exit the neuron, restoring the negative internal charge.

Front

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

Back

The all-or-nothing principle states that once the threshold is reached, an action potential will occur fully; there are no partial action potentials.

Front

What is the function of the myelin sheath?

Back

The myelin sheath insulates axons, allowing for faster transmission of action potentials through saltatory conduction.