Question 1

What action tends to open the sodium gates across a neuron's membrane?​

Accepted Answer

A)  hyperpolarization of the membrane
B)  ​depolarization of the membrane
C)  ​increase in the sodium concentration outside the neuron
D)  passing the peak of the action potential and entering the refractory periodE) B) and C)
F) A) and B)

Question 2

Both dendrites and cell bodies are capable of producing action potentials.​

Accepted Answer

A) True 
 B)False

Question 3

Neurons typically have one ____,but many ____.​

Accepted Answer

A)  dendrite; axons
B)  ​axon; dendrites
C)  ​cell body; axons
D)  dendrite; cell bodiesE) None of the above
F) A) and B)

Question 4

Describe how the brain transports essential chemicals.​

Accepted Answer

The brain has several transport mechanis...

Question 5

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

Accepted Answer

Once a neuron reaches the threshold of a...

Question 6

The structure that contains a cell's chromosomes is called the ____.​

Accepted Answer

A)  endoplasmic reticulum
B)  ​nucleus
C)  ​mitochondrion
D)  ribosomeE) B) and D)
F) A) and D)

Question 7

The cell membrane is composed of two layers of _____.​

Accepted Answer

A)  protein
B)  ​fat
C)  ​carbohydrate
D)  plasmaE) A) and C)
F) None of the above

Question 8

The surface of a dendrite is lined with specialized junctions through which the dendrite receives information from other neurons.What are these junctions called?​

Accepted Answer

A)  synaptic receptors
B)  ​axons
C)  ​synaptic hillocks
D)  gliaE) A) and C)
F) B) and D)

Question 9

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

Accepted Answer

A)  The toxic effects of sodium are minimized inside the cell.
B)  ​No energy is required to maintain it.
C)  ​The cell is prepared to respond quickly to a stimulus.
D)  All of the ions are maintained in equal concentrations throughout the cytoplasm.E) A) and D)
F) B) and D)

Question 10

A membrane produces an action potential whenever the potential across it reaches what level?​

Accepted Answer

A)  the resting potential
B)  ​-90 mV
C)  ​the threshold of excitation
D)  the refractory periodE) A) and B)
F) C) and D)

Question 11

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) B) and D)

Question 12

Chemicals are released by axons ____.​

Accepted Answer

A)  into the presynaptic terminal
B)  ​into the junction between neurons
C)  ​through the efferent terminals
D)  to the mitochondriaE) B) and C)
F) None of the above

Question 13

The concentration gradient refers to the ____.​

Accepted Answer

A)  fact that the concentration of ions is greater on the inside of a neuron
B)  ​fact that the concentration of ions is greater on the outside of a neuron
C)  ​difference in distribution for various ions between the inside and outside of the membrane
D)  negatively charged proteins inside the cellE) B) and C)
F) All of the above

Question 14

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) A) and C)
F) A) and B)

Question 15

What is the approximate resting potential of the inside of a neuron's membrane,relative to the outside?​

Accepted Answer

A)  -70 millivolts
B)  ​+10 millivolts
C)  ​0 millivolts
D)  +90 millivoltsE) A) and C)
F) B) and C)

Question 16

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) B) and D)
F) A) and B)

Question 17

Which type of glia builds myelin sheaths around axons in the periphery of the body?​

Accepted Answer

A)  astrocytes
B)  ​Schwann cells
C)  ​oligodendrocytes
D)  radial gliaE) None of the above
F) A) and B)

Question 18

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

Accepted Answer

A)  astrocytes
B)  ​Schwann cells
C)  ​oligodendrocytes
D)  radial gliaE) B) and D)
F) A) and B)

Question 19

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) B) and C)
F) C) and D)

Question 20

The resting potential of a neuron refers to the ____.​

Accepted Answer

A)  net positive charge on the inside of the neuron
B)  ​ions which rest in one place in the cell
C)  ​movement of ions to the outside of the neuron
D)  net negative charge on the inside of the neuronE) A) and D)
F) A) and C)

Exam 1: Nerve Cells and Nerve Impulses

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

Correct AnswerverifiedShow Answer

Both dendrites and cell bodies are capable of producing action potentials.​

Correct AnswerverifiedShow Answer

The structure that contains a cell's chromosomes is called the ____.​

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The concentration gradient refers to the ____.​

Correct AnswerverifiedShow Answer

Chemicals are released by axons ____.​

Correct AnswerverifiedShow Answer

A membrane produces an action potential whenever the potential across it reaches what level?​

Correct AnswerverifiedShow Answer

The resting potential of a neuron refers to the ____.​

Correct AnswerverifiedShow Answer

What action tends to open the sodium gates across a neuron's membrane?​

Correct AnswerverifiedShow Answer

What is the approximate resting potential of the inside of a neuron's membrane,relative to the outside?​

Correct AnswerverifiedShow Answer

The cell membrane is composed of two layers of _____.​

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Neurons typically have one ____,but many ____.​

Correct AnswerverifiedShow Answer

The surface of a dendrite is lined with specialized junctions through which the dendrite receives information from other neurons.What are these junctions called?​

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

Which type of glia builds myelin sheaths around axons in the periphery of the body?​

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Describe how the brain transports essential chemicals.​

Correct AnswerverifiedThe brain has several transport mechanis...View AnswerShow Answer

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

Correct Answer
verified

Both dendrites and cell bodies are capable of producing action potentials.

Correct Answer
verified

The structure that contains a cell's chromosomes is called the ____.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

The concentration gradient refers to the ____.

Correct Answer
verified

Chemicals are released by axons ____.

Correct Answer
verified

A membrane produces an action potential whenever the potential across it reaches what level?

Correct Answer
verified

The resting potential of a neuron refers to the ____.

Correct Answer
verified

What action tends to open the sodium gates across a neuron's membrane?

Correct Answer
verified

What is the approximate resting potential of the inside of a neuron's membrane,relative to the outside?

Correct Answer
verified

The cell membrane is composed of two layers of _____.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Neurons typically have one ,but many .

Correct Answer
verified

The surface of a dendrite is lined with specialized junctions through which the dendrite receives information from other neurons.What are these junctions called?

Correct Answer
verified

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

Correct Answer
verified
Once a neuron reaches the threshold of a...
View Answer

Which type of glia builds myelin sheaths around axons in the periphery of the body?

Correct Answer
verified

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

Correct Answer
verified

Describe how the brain transports essential chemicals.

Correct Answer
verified
The brain has several transport mechanis...
View Answer