Exam 2: Nerve Cells and Nerve Impulses

Negatively charged ions like ____ are mostly located outside the cell.

What will affect the speed of an action potential?

If you were to stub your toe and feel the pressure a second or two before you feel the pain, then which of the following statements is most likely true?

When the potential across a membrane reaches threshold, the sodium channels:

In a myelinated axon, sodium channels are absent in the nodes of Ranvier.

Which type of glia release chemicals that modify the activity of neighboring neurons?

What happens to a virus that manages to cross the blood-brain barrier and enter the brain?

An efferent axon carries information away from a structure.

Why do neurons have a resting potential?

A presynaptic terminal is also known as:

At the peak of the action potential, the electrical gradient of potassium:

When a neuron's membrane is at rest, the concentration gradient tends to move sodium ____ the cell and the electrical gradient tends to move it ____ the cell.

Which group is most likely to suffer from a thiamine deficiency?

The information sender of the neuron, which conveys an impulse toward either other neurons or a gland or muscle, is called the:

At what point do the sodium gates begin to close, shutting out further entry of sodium into the cell?

The all-or-none law states that:

Which of the following represents the all-or-none law?

When the neuron is at rest, what is responsible for moving sodium ions out of the cell?

The concentration gradient refers to:

Ribosomes are the part of a cell that: