2024 Practice Nervous System

Front

What ions are primarily involved in the generation of an electrical nerve impulse?

Back

Potassium and Sodium

Front

What is the insulating membrane that surrounds parts of the axon and helps impulses travel faster?

Back

Myelin Sheath

Front

In a neuron, what does the letter 'C' typically represent?

Back

Cell Body

Front

Where does depolarization and repolarization occur in a myelinated neuron?

Back

Node of Ranvier

Front

What is the charge of a neuron at rest?

Back

The exterior of the neuron is more positively charged relative to the interior, with an excess amount of sodium ions found on the exterior portion of the neuron.

Front

What is the function of the Myelin Sheath?

Back

To insulate the axon and increase the speed of electrical impulses.

Front

What role do Schwann Cells play in the nervous system?

Back

They produce the Myelin Sheath around peripheral nerve fibers.

Front

What is the difference between depolarization and repolarization?

Back

Depolarization is the process of the membrane potential becoming less negative (more positive), while repolarization is the return to the resting membrane potential.

Front

What is the significance of the Node of Ranvier in nerve conduction?

Back

It allows for saltatory conduction, where the nerve impulse jumps from one node to the next, increasing speed.

Front

What is the role of dendrites in a neuron?

Back

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