Question 1

Mae is studying for an exam on the action potential. She writes in her notes that the sodium channel closes ______.

Accepted Answer

A)   when the electrical gradient for sodium is eliminated
B)   after the neuron reaches threshold
C)   at the peak of the action potential
D)   as a result of the refractory periodsE) A) and B)
F) A) and C)

Question 2

Professor Windell is lecturing about the resting potential of neurons. He will tell his class that the resting potential is advantageous because _____.

Accepted Answer

A)   it minimizes the toxic effects of sodium
B)   the cell is ready to produce an action potential quickly following a stimulus
C)   it prevents the cell from having to use any energy to keep itself prepared to fire an action potential.
D)   this maintains equal levels of the ions both inside and outside of the neuronE) All of the above
F) C) and D)

Question 3

The role of glial cells is to act like "glue" or scaffolding to support the neurons.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A)   Concentration gradient
B)   Generator potential
C)   Resting potential
D)   Shock gradientE) B) and C)
F) C) and D)

Question 5

As compared to dendrites, axons usually ____.

Accepted Answer

A)   form the information-receiving pole of the neuron
B)   are shorter in length
C)   are covered with myelin
D)   taper in diameter toward their peripheryE) None of the above
F) A) and D)

Question 6

The branching fibers that form the information-receiving pole of the nerve cells are called _____.

Accepted Answer

A)   motor neurons
B)   dendrites
C)   sensory neurons
D)   axonsE) All of the above
F) B) and D)

Question 7

Zandra is studying about the ions involved in the action potential. She records in her notes that ____.

Accepted Answer

A)   the concentration of sodium remains more concentrated outside the neuron than inside even during an action potential
B)   the concentration of potassium remains more concentrated outside the neuron than inside even during an action potential
C)   the concentration of sodium and potassium equalize across the membrane during an action potential
D)   during an action potential, the sodium channels stay open for a long period of timeE) None of the above
F) C) and D)

Question 8

Jena has been assigned a project for school where she is asked to demonstrate the activity of the sodium-potassium pump using yellow marbles to represent sodium and green marbles to represent potassium. How many marbles will Jena need and explain how she could demonstrate the movement of the ions through the pump?

Accepted Answer

Jena needs to explain to the class that ...

Question 9

In order to produce an action potential, the collective amount of depolarization must exceed the _____

Accepted Answer

A)   threshold of excitation
B)   energy required to open the potassium channels
C)   absolute refractory period
D)   resting membrane potentialE) All of the above
F) A) and D)

Question 10

The major disadvantage of a blood-brain barrier is that ____.

Accepted Answer

A)   many chemicals can easily diffuse into the brain
B)   so much glucose is required to maintain it
C)   certain required chemicals must be actively transported
D)   viruses cannot escapeE) All of the above
F) A) and B)

Question 11

Terrance went to the dentist and was given some Novocain. This prevented him from feeling pain because the drug ____.

Accepted Answer

A)   attached to sodium channels letting in sodium and stopping the action potential from sending a pain message
B)   attached to potassium channels letting in potassium and stopping the action potential from sending a pain message
C)   attached to potassium channels blocking potassium from entering and stopping the action potential from sending a pain message
D)   attached to sodium channels blocking sodium from entering and stopping the action potential from sending a pain messageE) A) and B)
F) A) and C)

Question 12

When the potential across a membrane reaches threshold, the sodium channels ____.

Accepted Answer

A)   open to let sodium enter the cell rapidly
B)   close to prevent sodium from entering the cell
C)   open to let sodium exit the cell rapidly
D)   close to prevent sodium from exiting the cellE) None of the above
F) A) and D)

Question 13

Santiago Ramón y Cajal used special staining techniques to reveal that the brain is composed of individual cells.

Accepted Answer

A) True 
 B)False

Question 14

What mechanism prevents or slows some chemicals from entering the brain, while allowing others to enter?

Accepted Answer

A)   A threshold
B)   A blood-brain barrier
C)   An endoplasmic wall
D)   A differential-drug inhibitorE) None of the above
F) All of the above

Question 15

Which event will increase the concentration gradient of sodium?

Accepted Answer

A)   Decreasing permeability to potassium ions
B)   Increasing activity of the sodium potassium pump
C)   Increasing membrane permeability to sodium ions
D)   Increasing membrane permeability to chloride ionsE) All of the above
F) A) and D)

Question 16

The speed of an action potential down an unmyelinated axon is best described as ____.

Accepted Answer

A)   the speed of electricity, regardless of the size of the axon
B)   less than 1 meter per second, regardless of the size of the axon
C)   faster in thin axons than in thick ones
D)   faster in thick axons than in thin onesE) All of the above
F) B) and D)

Question 17

Under which conditions would the sodium-potassium pump likely be far less effective in creating a concentration gradient?

Accepted Answer

A)   if dendrites were generally longer than axons
B)   if the glia-to-neuron ratio were higher
C)   if selective permeability of the membrane did not exist
D)   if it were an active transport system that required energyE) All of the above
F) A) and B)

Question 18

If all of a neuron's dendrites or axons were contained within the spinal cord, it would be considered a(n)  ____ neuron.

Accepted Answer

A)   efferent
B)   afferent
C)   intrinsic
D)   PurkinjeE) None of the above
F) B) and C)

Question 19

Action potentials can be produced in the dendrites of some neurons.

Accepted Answer

A) True 
 B)False

Question 20

The blood-brain barrier is made up of closely packed glial cells.

Accepted Answer

A) True 
 B)False

Exam 1: Nerve Cells and Nerve Impulses

The role of glial cells is to act like "glue" or scaffolding to support the neurons.

Correct Answer
verified

The branching fibers that form the information-receiving pole of the nerve cells are called _____.

Correct Answer
verified

Professor Windell is lecturing about the resting potential of neurons. He will tell his class that the resting potential is advantageous because _____.

Correct Answer
verified

The major disadvantage of a blood-brain barrier is that ____.

Correct Answer
verified

As compared to dendrites, axons usually ____.

Correct Answer
verified

What mechanism prevents or slows some chemicals from entering the brain, while allowing others to enter?

Correct Answer
verified

The blood-brain barrier is made up of closely packed glial cells.

Correct Answer
verified

Terrance went to the dentist and was given some Novocain. This prevented him from feeling pain because the drug ____.

Correct Answer
verified

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

Correct Answer
verified

Under which conditions would the sodium-potassium pump likely be far less effective in creating a concentration gradient?

Correct Answer
verified

Which event will increase the concentration gradient of sodium?

Correct Answer
verified

Zandra is studying about the ions involved in the action potential. She records in her notes that ____.

Correct Answer
verified

Action potentials can be produced in the dendrites of some neurons.

Correct Answer
verified

When the potential across a membrane reaches threshold, the sodium channels ____.

Correct Answer
verified

Correct Answer
verified
Jena needs to explain to the class that ...
View Answer

The speed of an action potential down an unmyelinated axon is best described as ____.

Correct Answer
verified

Mae is studying for an exam on the action potential. She writes in her notes that the sodium channel closes ______.

Correct Answer
verified

In order to produce an action potential, the collective amount of depolarization must exceed the _____

Correct Answer
verified

If all of a neuron's dendrites or axons were contained within the spinal cord, it would be considered a(n) ____ neuron.

Correct Answer
verified

Santiago Ramón y Cajal used special staining techniques to reveal that the brain is composed of individual cells.

Correct Answer
verified

Exam 1: Nerve Cells and Nerve Impulses

The role of glial cells is to act like "glue" or scaffolding to support the neurons.

Correct AnswerverifiedShow Answer

The branching fibers that form the information-receiving pole of the nerve cells are called _____.

Correct AnswerverifiedShow Answer

Professor Windell is lecturing about the resting potential of neurons. He will tell his class that the resting potential is advantageous because _____.

Correct AnswerverifiedShow Answer

The major disadvantage of a blood-brain barrier is that ____.

Correct AnswerverifiedShow Answer

As compared to dendrites, axons usually ____.

Correct AnswerverifiedShow Answer

What mechanism prevents or slows some chemicals from entering the brain, while allowing others to enter?

Correct AnswerverifiedShow Answer

The blood-brain barrier is made up of closely packed glial cells.

Correct AnswerverifiedShow Answer

Terrance went to the dentist and was given some Novocain. This prevented him from feeling pain because the drug ____.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Under which conditions would the sodium-potassium pump likely be far less effective in creating a concentration gradient?

Correct AnswerverifiedShow Answer

Which event will increase the concentration gradient of sodium?

Correct AnswerverifiedShow Answer

Zandra is studying about the ions involved in the action potential. She records in her notes that ____.

Correct AnswerverifiedShow Answer

Action potentials can be produced in the dendrites of some neurons.

Correct AnswerverifiedShow Answer

When the potential across a membrane reaches threshold, the sodium channels ____.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedJena needs to explain to the class that ...View AnswerShow Answer

The speed of an action potential down an unmyelinated axon is best described as ____.

Correct AnswerverifiedShow Answer

Mae is studying for an exam on the action potential. She writes in her notes that the sodium channel closes ______.

Correct AnswerverifiedShow Answer

In order to produce an action potential, the collective amount of depolarization must exceed the _____

Correct AnswerverifiedShow Answer

If all of a neuron's dendrites or axons were contained within the spinal cord, it would be considered a(n) ____ neuron.

Correct AnswerverifiedShow Answer

Santiago Ramón y Cajal used special staining techniques to reveal that the brain is composed of individual cells.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Jena needs to explain to the class that ...
View Answer

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Correct Answer
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Correct Answer
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Correct Answer
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