Question 1

Provide a summary of the all-or-none law of action potentials.

Accepted Answer

Once a neuron reaches the threshold of a...

Question 2

Dendrites ____.

Accepted Answer

A)   contain the nucleus, ribosomes, and other structures found in most cells
B)   are branching fibers that get narrower near their ends
C)   are thin fibers of constant diameter
D)   are an insulating material that cover an axonE) C) and D)
F) All of the above

Question 3

Jena is reviewing her notes on action potentials for a quiz. She makes an extra notation that before the action potential when the neuron is at rest, sodium channels _____.

Accepted Answer

A)   are open and allow sodium ions to flow through easily
B)   are closed and don't allow sodium to pass through.
C)   are partially open, so sodium leaks through slowly
D)   are partially open but at equilibrium, so the sodium doesn't moveE) All of the above
F) A) and D)

Question 4

Voltage-activated channels are channels for which a change in the voltage across the membrane alters their ____.

Accepted Answer

A)   permeability
B)   length
C)   number
D)   thresholdE) C) and D)
F) B) and D)

Question 5

As a general rule, axons convey information ____.

Accepted Answer

A)   toward dendrites of their own cell
B)   toward their own cell body
C)   away from their own cell body
D)   to surrounding gliaE) A) and D)
F) None of the above

Question 6

Explain the function and process of a neuron's refractory period.

Accepted Answer

Although the electrical potential across...

Question 7

Dr. Skinner is working in the lab measuring the voltage of neurons, and during one condition, she tried to depolarize the neurons from -70 mV to -80 mV.

Accepted Answer

A) True 
 B)False

Question 8

The endoplasmic reticulum is a ____.

Accepted Answer

A)   network of thin tubes that transport newly synthesized proteins
B)   site where the cell synthesizes new protein molecules
C)   structure that separates the inside of the cell from the outside
D)   structure that contains the chromosomesE) All of the above
F) A) and C)

Question 9

Which action would depolarize a neuron?

Accepted Answer

A)   Decreasing membrane permeability to calcium
B)   Increasing membrane permeability to potassium
C)   Decreasing membrane permeability to sodium
D)   Increasing membrane permeability to sodiumE) A) and B)
F) None of the above

Question 10

The tree-like branches of a neuron that receive information from other neurons are called _____.

Accepted Answer

A)   axons
B)   dendrites
C)   soma
D)   myelinE) B) and C)
F) A) and D)

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

After the peak of an action potential, what prevents sodium ions from continuing to enter the cell?

Accepted Answer

A)   There is no longer a concentration gradient for sodium.
B)   The sodium-potassium pump greatly increases its rate of activity.
C)   All the available sodium ions have already entered the cell.
D)   The sodium gates in the membrane close.E) C) and D)
F) A) and D)

Question 13

Professor Michaels is explaining to his students that, when the neuron is at rest, ______ is mostly responsible for the movement of potassium ions out of the cell.

Accepted Answer

A)   potassium's electrical gradient
B)   potassium's concentration gradient
C)   the sodium-potassium pump
D)   sodium's electrical gradientE) None of the above
F) A) and B)

Question 14

The membrane of a neuron is composed of ____ with ____ embedded in them.

Accepted Answer

A)   carbohydrates; purines
B)   phospholipids; proteins
C)   proteins; neurotransmitters
D)   benzene molecules; carbohydratesE) B) and C)
F) A) and D)

Question 15

What causes potassium ions to leave the axon just after the peak of the action potential?

Accepted Answer

A)   A continuing concentration gradient and the opening of the potassium gates
B)   An increase in the concentration gradient across the membrane
C)   An increased tendency of the sodium-potassium pump to push potassium out
D)   Binding of potassium ions to proteins that leave at this timeE) None of the above
F) A) and B)

Question 16

In order to change the amount of polarization of a neuron, Professor Alley would need to change the difference in voltage between _____.

Accepted Answer

A)   the dendrites and the axon hillock
B)   the axon and the soma
C)   inside the nucleus and outside the nucleus
D)   inside the cell and outside the cellE) A) and B)
F) A) and D)

Question 17

Which type of glia remove waste material in the nervous system?

Accepted Answer

A)   Astrocytes
B)   Schwann cells
C)   Oligodendrocytes
D)   Radial gliaE) None of the above
F) A) and B)

Question 18

What type of neuron in the pons receives information only from other cells in the pons and sends information only to other cells in the pons?

Accepted Answer

A)   Afferent
B)   Efferent
C)   Intrinsic
D)   Inter-synapticE) B) and D)
F) A) and C)

Question 19

Dr. Delillo studies the resting potential of neurons. He has found that _______ is the main reason the neuron is able to maintain the resting potential.

Accepted Answer

A)   the size difference between the axon and dendrites
B)   the sodium-potassium pump
C)   the concentration gradient
D)   the refractory period of the membraneE) A) and B)
F) All of the above

Question 20

Increasing the electrical gradient for potassium will reduce the tendency for potassium ions to exit the neuron.

Accepted Answer

A) True 
 B)False

Exam 1: Nerve Cells and Nerve Impulses

After the peak of an action potential, what prevents sodium ions from continuing to enter the cell?

Correct AnswerverifiedShow Answer

Explain the function and process of a neuron's refractory period.

Correct AnswerverifiedAlthough the electrical potential across...View AnswerShow Answer

Dr. Skinner is working in the lab measuring the voltage of neurons, and during one condition, she tried to depolarize the neurons from -70 mV to -80 mV.

Correct AnswerverifiedShow Answer

Which action would depolarize a neuron?

Correct AnswerverifiedShow Answer

What causes potassium ions to leave the axon just after the peak of the action potential?

Correct AnswerverifiedShow Answer

Dendrites ____.

Correct AnswerverifiedShow Answer

The tree-like branches of a neuron that receive information from other neurons are called _____.

Correct AnswerverifiedShow Answer

Increasing the electrical gradient for potassium will reduce the tendency for potassium ions to exit the neuron.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Provide a summary of the all-or-none law of action potentials.

Correct AnswerverifiedOnce a neuron reaches the threshold of a...View AnswerShow Answer

The membrane of a neuron is composed of ____ with ____ embedded in them.

Correct AnswerverifiedShow Answer

Which type of glia remove waste material in the nervous system?

Correct AnswerverifiedShow Answer

What type of neuron in the pons receives information only from other cells in the pons and sends information only to other cells in the pons?

Correct AnswerverifiedShow Answer

As a general rule, axons convey information ____.

Correct AnswerverifiedShow Answer

Jena is reviewing her notes on action potentials for a quiz. She makes an extra notation that before the action potential when the neuron is at rest, sodium channels _____.

Correct AnswerverifiedShow Answer

The endoplasmic reticulum is a ____.

Correct AnswerverifiedShow Answer

In order to change the amount of polarization of a neuron, Professor Alley would need to change the difference in voltage between _____.

Correct AnswerverifiedShow Answer

Voltage-activated channels are channels for which a change in the voltage across the membrane alters their ____.

Correct AnswerverifiedShow Answer

Professor Michaels is explaining to his students that, when the neuron is at rest, ______ is mostly responsible for the movement of potassium ions out of the cell.

Correct AnswerverifiedShow Answer

Dr. Delillo studies the resting potential of neurons. He has found that _______ is the main reason the neuron is able to maintain the resting potential.

Correct AnswerverifiedShow Answer

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Although the electrical potential across...
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Once a neuron reaches the threshold of a...
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The membrane of a neuron is composed of with embedded in them.

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