Exam 2: Nerve Cells and Nerve Impulses

Axons are covered with an insulating material called a myelin sheath.

When the neuron is at rest, what is responsible for moving potassium ions OUT of the cell?

Which of the following is an important function of the blood-brain barrier?

Suppose we applied a drug to a neuron that caused its sodium gates to suddenly open wide. What would happen?

One disadvantage of the blood-brain barrier is that it keeps out most forms of nutrition.

Myelin covers:

Which two factors affect the speed of an action potential?

If the brain does not have enough thiamine, what is it unable to do?

A greater amount of branching on dendrites allows them to:

What is the difference in voltage called that typically exists between the inside and the outside of a neuron?

When the neuronal membrane is at rest, the sodium channels:

Which of the following is an advantage of having a resting potential?

Which of the following would produce a hyperpolarization of a neuron?

Who was the first researcher to demonstrate that neurons are separate from one another?

Protein channels allow ____ to cross the cell membrane.

Stimulation of a neuron beyond a certain level is called the:

Which of the following is NOT true of astrocytes?

When the neuron is at rest, what is responsible for moving potassium ions into the cell?

What is one major cause for the resting potential of a neuron's membrane?

Dendrites contain the nuclei, ribosomes, mitochondria, and other structures found in most cells.