2024 Nervous System Test

Front

What is the 'all-or-none' principle in neuronal action potentials?

Back

It means that an action potential is either fully triggered or not triggered at all, regardless of stimulus strength, once the threshold is reached.

Front

What does the letter 'E' represent in a labeled neuron diagram?

Back

Myelin Sheath

Front

What occurs when potassium (K+) rushes out of the cell?

Back

Repolarization, making the membrane potential more negative.

Front

What is the function of dopamine as a neurotransmitter?

Back

Reward-motivated behavior and pleasure.

Front

What is the chemical used by a neuron to transmit an impulse across a synapse?

Back

Neurotransmitters.

Front

Define a neuron.

Back

A neuron is a specialized cell that transmits nerve impulses.

Front

What is the role of the myelin sheath?

Back

To insulate axons and increase the speed of nerve impulse transmission.

Front

What is depolarization in the context of action potentials?

Back

The process where the membrane potential becomes less negative, leading to the firing of an action potential.

Front

What is hyperpolarization?

Back

A change in a cell's membrane potential that makes it more negative than the resting potential.

Front

What is the synapse?

Back

The junction between two neurons where neurotransmitters are released.