Question 1

An excitatory postsynaptic potential is most likely to result from which of the following?

Accepted Answer

A)  Simultaneous opening of sodium and chloride channels
B)  Opening of potassium channels
C)  Opening of sodium channels
D)  Opening of calcium channelsE) A) and D)
F) A) and C)

Question 2

Posttetanic facilitation is thought to be the result of which of the following?

Accepted Answer

A)  Opening voltage-gated sodium channels
B)  Opening transmitter-gated potassium channels
C)  A buildup of calcium in the presynaptic terminal
D)  Electrotonic conductionE) A) and B)
F) None of the above

Question 3

Which of the following neurotransmitters is thought to be involved in the phenomenon of presynaptic inhibition?

Accepted Answer

A)  GABA
B)  Serotonin
C)  Norepinephrine
D)  AcetylcholineE) A) and D)
F) B) and C)

Question 4

An inhibitory postsynaptic potential is most likely to result from opening which of the following?

Accepted Answer

A)  Potassium channels
B)  Sodium channels
C)  Voltage-gated sodium channels
D)  Voltage-gated calcium channelsE) B) and D)
F) A) and C)

Question 5

In a neuron with a resting membrane potential of -65 mV, the distribution of which ion across the neuronal membrane represents the greatest potential electromotive force?

Accepted Answer

A)  Potassium
B)  Chloride
C)  Sodium
D)  CalciumE) A) and B)
F) All of the above

Question 6

Forced rapid breathing results in alkalization of the blood, which would lead to which of the following changes in neuronal activity?

Accepted Answer

A)  A decrease in neuronal activity
B)  An increase in neuronal activity
C)  An initial decrease followed by an increase
D)  No change in neuronal activityE) B) and C)
F) A) and D)

Question 7

Transmitter activation of ion channels on dendrites can dictate neuronal excitation or inhibition acutely by affecting which aspect of the soma membrane?

Accepted Answer

A)  Electrical capacitance
B)  Electrical potential
C)  Structure
D)  Surface areaE) B) and C)
F) A) and B) B

Question 8

Increased conductance of which of the following ions is most likely to have the least effect on membrane potential?

Accepted Answer

A)  Chloride
B)  Potassium
C)  SodiumD) A) and C)
E) A) and B) A

Question 9

In a neuron with a resting membrane potential of -65 mV, the distribution of which ion across the neuronal membrane represents the least potential electromotive force?

Accepted Answer

A)  Potassium
B)  Chloride
C)  Sodium
D)  CalciumE) None of the above
F) C) and D)

Question 10

The opening of which of the following ion channels would have the least effect on the resting membrane potential of an average neuron?

Accepted Answer

A)  Sodium
B)  Potassium
C)  ChlorideD) None of the above
E) All of the above C

Question 11

Hypoventilation causes arterial blood carbon dioxide levels to rise. Higher arterial blood carbon dioxide levels increase neuronal activity.

Accepted Answer

A)  Both statements are correct
B)  Both statements are incorrect
C)  The first statement is correct; the second statement is not correct
D)  The first statement is not correct; the second statement is correctE) A) and C)
F) All of the above

Question 12

Transmission of the electrical signal from the dendrites to the soma of a neuron occurs by which of the following?

Accepted Answer

A)  Short circuit current flow
B)  An action potential mechanism
C)  Electrotonic conduction
D)  Capacitive dischargeE) B) and C)
F) None of the above

Question 13

Prolonged changes in neuronal activity are achieved through the activation of which of the following?

Accepted Answer

A)  Voltage gated chloride channels
B)  Transmitter gated sodium channels
C)  G-protein coupled channels
D)  Voltage gated potassium channelsE) A) and C)
F) B) and C)

Question 14

Hypoventilation is most likely to have which of the following effects on a typical neuron in the central nervous system?

Accepted Answer

A)  Decreased neuronal activity
B)  Increased neuronal activity
C)  Increased synaptic delay
D)  Decreased synaptic delayE) B) and D)
F) A) and B)

Question 15

Which of the following statements best describes the role of calcium in the release of a neurotransmitter substance from the presynaptic nerve terminal?

Accepted Answer

A)  Calcium entry into the presynaptic terminal prevents the release of the neurotransmitter
B)  Calcium entry into the presynaptic terminal is necessary for the release of the neurotransmitter
C)  Calcium induces the opening of calcium-dependent sodium channels on the presynaptic terminal
D)  Calcium entry into the presynaptic terminal results in the formation of cyclic adenosine monophosphate, which induces a conformational change in the presynaptic sodium channel that leads to the release of neurotransmitterE) C) and D)
F) B) and C)

Exam 46: Organization of the Nervous System, Basic Functions of Synapses, and Neurotransmitters

An excitatory postsynaptic potential is most likely to result from which of the following?

Correct Answer
verified

Posttetanic facilitation is thought to be the result of which of the following?

Correct Answer
verified

Which of the following neurotransmitters is thought to be involved in the phenomenon of presynaptic inhibition?

Correct Answer
verified

An inhibitory postsynaptic potential is most likely to result from opening which of the following?

Correct Answer
verified

In a neuron with a resting membrane potential of -65 mV, the distribution of which ion across the neuronal membrane represents the greatest potential electromotive force?

Correct Answer
verified

Forced rapid breathing results in alkalization of the blood, which would lead to which of the following changes in neuronal activity?

Correct Answer
verified

Transmitter activation of ion channels on dendrites can dictate neuronal excitation or inhibition acutely by affecting which aspect of the soma membrane?

Correct Answer
verified
B

Increased conductance of which of the following ions is most likely to have the least effect on membrane potential?

Correct Answer
verified
A

In a neuron with a resting membrane potential of -65 mV, the distribution of which ion across the neuronal membrane represents the least potential electromotive force?

Correct Answer
verified

The opening of which of the following ion channels would have the least effect on the resting membrane potential of an average neuron?

Correct Answer
verified
C

Hypoventilation causes arterial blood carbon dioxide levels to rise. Higher arterial blood carbon dioxide levels increase neuronal activity.

Correct Answer
verified

Transmission of the electrical signal from the dendrites to the soma of a neuron occurs by which of the following?

Correct Answer
verified

Prolonged changes in neuronal activity are achieved through the activation of which of the following?

Correct Answer
verified

Hypoventilation is most likely to have which of the following effects on a typical neuron in the central nervous system?

Correct Answer
verified

Which of the following statements best describes the role of calcium in the release of a neurotransmitter substance from the presynaptic nerve terminal?

Correct Answer
verified

Exam 46: Organization of the Nervous System, Basic Functions of Synapses, and Neurotransmitters

An excitatory postsynaptic potential is most likely to result from which of the following?

Correct AnswerverifiedShow Answer

Posttetanic facilitation is thought to be the result of which of the following?

Correct AnswerverifiedShow Answer

Which of the following neurotransmitters is thought to be involved in the phenomenon of presynaptic inhibition?

Correct AnswerverifiedShow Answer

An inhibitory postsynaptic potential is most likely to result from opening which of the following?

Correct AnswerverifiedShow Answer

In a neuron with a resting membrane potential of -65 mV, the distribution of which ion across the neuronal membrane represents the greatest potential electromotive force?

Correct AnswerverifiedShow Answer

Forced rapid breathing results in alkalization of the blood, which would lead to which of the following changes in neuronal activity?

Correct AnswerverifiedShow Answer

Transmitter activation of ion channels on dendrites can dictate neuronal excitation or inhibition acutely by affecting which aspect of the soma membrane?

Correct AnswerverifiedB

Increased conductance of which of the following ions is most likely to have the least effect on membrane potential?

Correct AnswerverifiedA

In a neuron with a resting membrane potential of -65 mV, the distribution of which ion across the neuronal membrane represents the least potential electromotive force?

Correct AnswerverifiedShow Answer

The opening of which of the following ion channels would have the least effect on the resting membrane potential of an average neuron?

Correct AnswerverifiedC

Hypoventilation causes arterial blood carbon dioxide levels to rise. Higher arterial blood carbon dioxide levels increase neuronal activity.

Correct AnswerverifiedShow Answer

Transmission of the electrical signal from the dendrites to the soma of a neuron occurs by which of the following?

Correct AnswerverifiedShow Answer

Prolonged changes in neuronal activity are achieved through the activation of which of the following?

Correct AnswerverifiedShow Answer

Hypoventilation is most likely to have which of the following effects on a typical neuron in the central nervous system?

Correct AnswerverifiedShow Answer

Which of the following statements best describes the role of calcium in the release of a neurotransmitter substance from the presynaptic nerve terminal?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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A

Correct Answer
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Correct Answer
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C

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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