Question 1

Which process is responsible for the release of neurotransmitters from the presynaptic neuron into the synapse?

Accepted Answer

A)   diffusion
B)   endocytosis
C)   exocytosis
D)   fusion
E)   synaptic releaseF) B) and E)
G) None of the above

Question 2

Explain how the resting membrane potential and resting ion distributions are established in a neuron.

Accepted Answer

A resting membrane potential of -70 mV i...

Question 3

The additive effect of one neuron sending many EPSPs to another neuron over a brief period of time is called spatial summation .

Accepted Answer

A) True 
 B)False

Question 4

An action potential is propagated down an unmyelinated neuronal plasma membrane because it stimulates voltage-gated ____ channels adjacent to it. (Choose the most accurate answer.)

Accepted Answer

A)   Na+
B)   Ca2+
C)   K+
D)   Na+and Ca2+
E)   K+and Ca2+F) A) and D)
G) B) and D)

Question 5

The intensity of an electrical impulse is reflected in the ____ of action potentials.

Accepted Answer

A)   frequency
B)   magnitude
C)   duration
D)   intensity
E)   the frequency and durationF) C) and D)
G) A) and D)

Question 6

+channel inactivation stop the inward flow of Na+? A)  A B)  B C)  C D)  D E)  E" class="answers-bank-image d-inline" rel="preload" > Figure 39.1
-Answer the question using the accompanying figure. At which point in this action potential diagram does the onset of Na+channel inactivation stop the inward flow of Na+?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   EF) A) and B)
G) A) and D)

Question 7

As the action potential peaks, ____.

Accepted Answer

A)   the activation gates of Na+channels close
B)   the inactivation gates of Na+channels close
C)   the activation gates of K+channels close
D)   Na+/K+active transport pumps are activatedE) B) and C)
F) A) and D)

Question 8

If the equilibrium potential is close to the resting membrane potential, the net ionic movement across the membrane will be very small.

Accepted Answer

A) True 
 B)False

Question 9

Explain how neuron action potential propagation rate can be increased.

Accepted Answer

Neuron action potential propagation can be increased in two ways: (1) by increasing axonal diameter, and (2) myelinating the axon. Increased axonal diameter reduces electrical resistance to current flow. Myelination causes an electrical current to "jump" from one node of Ranvier to the next by saltatory conduction, which is more rapid than conduction in an unmyelinated neuron.

Question 10

In an effort to determine the mechanism of neuronal signaling, Otto Loewi isolated ____.

Accepted Answer

A)   frog hearts
B)   frog brains
C)   rat hearts
D)   rat brains
E)   rat vagus nerveF) A) and D)
G) D) and E)

Question 11

Which neuronal structure has the greatest density of voltage-gated Na+channels, resulting in the lowest threshold potential along a neuron?

Accepted Answer

A)   dendrites
B)   cell body
C)   axon hillock
D)   axon
E)   axon terminalsF) A) and B)
G) A) and E)

Question 12

Most neurons that release GABA and glycine are ____.

Accepted Answer

A)   astrocytes
B)   projection neurons
C)   interneurons
D)   oligodendrocytes
E)   Schwann cellsF) D) and E)
G) A) and B)

Question 13

What is the typical resting potential of an isolated neuron?

Accepted Answer

A)   -60 mV
B)   -70 mV
C)   -80 mV
D)   -90 mV
E)   100 mVF) A) and B)
G) None of the above B

Question 14

A graded, subthreshold change in the postsynaptic membrane potential that moves it toward threshold is called a(n)  ____.

Accepted Answer

A)   IPSP
B)   hyperpolarization
C)   EPSP
D)   depolarization
E)   repolarizationF) All of the above
G) A) and C)

Question 15

Which neurotransmitter is most likely to be inhibitory?

Accepted Answer

A)   glutamate
B)   dopamine
C)   Substance P
D)   GABA
E)   acetylcholineF) C) and D)
G) A) and B)

Question 16

Where are most synapses formed?

Accepted Answer

A)   on the dendrites of postsynaptic neurons
B)   on cell bodies
C)   on axon terminals
D)   on oligodendrocytes
E)   on Schwann cellsF) D) and E)
G) None of the above

Question 17

Place the events in chemical synapse transmission in the correct order. (1)    Ca2+enters axon terminal.
(2)   Ligand-gated ion channels open in postsynaptic membrane.
(3)    Neurotransmitter binds to postsynaptic receptor.
(4)    Action potential reaches axon terminal of presynaptic neuron.
(5)    Neurotransmitter released by exocytosis.

Accepted Answer

A)   4, 1, 5, 3, 2
B)   4, 3, 1, 5, 2
C)   4, 5, 1, 3, 2
D)   4, 1, 3, 5, 2
E)   4, 5, 2, 3, 1F) A) and E)
G) D) and E)

Question 18

Oligodendrocytes are responsible for myelinating central nervous system axons.

Accepted Answer

A) True 
 B)False  True

Question 19

Which cells assist and nourish neurons that transmit electrical signals?

Accepted Answer

A)   receptor cells
B)   neurons
C)   effector cells
D)   glial cells
E)   signal cellsF) C) and D)
G) B) and C)

Question 20

+channel close to stabilize the membrane potential? A)  A B)  B C)  C D)  D E)  E" class="answers-bank-image d-inline" rel="preload" > Figure 39.1
-Answer the question using the accompanying figure. At which point in this action potential diagram does the K+channel close to stabilize the membrane potential?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   EF) A) and C)
G) A) and E)

Exam 39: Information Flow and the Neuron

Which process is responsible for the release of neurotransmitters from the presynaptic neuron into the synapse?

Correct Answer
verified

Explain how the resting membrane potential and resting ion distributions are established in a neuron.

Correct Answer
verified
A resting membrane potential of -70 mV i...
View Answer

The additive effect of one neuron sending many EPSPs to another neuron over a brief period of time is called spatial summation .

Correct Answer
verified

An action potential is propagated down an unmyelinated neuronal plasma membrane because it stimulates voltage-gated ____ channels adjacent to it. (Choose the most accurate answer.)

Correct Answer
verified

The intensity of an electrical impulse is reflected in the ____ of action potentials.

Correct Answer
verified

Figure 39.1 -Answer the question using the accompanying figure. At which point in this action potential diagram does the onset of Na⁺channel inactivation stop the inward flow of Na⁺?

Correct Answer
verified

As the action potential peaks, ____.

Correct Answer
verified

If the equilibrium potential is close to the resting membrane potential, the net ionic movement across the membrane will be very small.

Correct Answer
verified

Explain how neuron action potential propagation rate can be increased.

In an effort to determine the mechanism of neuronal signaling, Otto Loewi isolated ____.

Correct Answer
verified

Which neuronal structure has the greatest density of voltage-gated Na⁺channels, resulting in the lowest threshold potential along a neuron?

Correct Answer
verified

Most neurons that release GABA and glycine are ____.

Correct Answer
verified

What is the typical resting potential of an isolated neuron?

Correct Answer
verified
B

A graded, subthreshold change in the postsynaptic membrane potential that moves it toward threshold is called a(n) ____.

Correct Answer
verified

Which neurotransmitter is most likely to be inhibitory?

Correct Answer
verified

Where are most synapses formed?

Correct Answer
verified

Correct Answer
verified

Oligodendrocytes are responsible for myelinating central nervous system axons.

Correct Answer
verified
True

Which cells assist and nourish neurons that transmit electrical signals?

Correct Answer
verified

Figure 39.1 -Answer the question using the accompanying figure. At which point in this action potential diagram does the K⁺channel close to stabilize the membrane potential?

Correct Answer
verified

Exam 39: Information Flow and the Neuron

Which process is responsible for the release of neurotransmitters from the presynaptic neuron into the synapse?

Correct AnswerverifiedShow Answer

Explain how the resting membrane potential and resting ion distributions are established in a neuron.

Correct AnswerverifiedA resting membrane potential of -70 mV i...View AnswerShow Answer

The additive effect of one neuron sending many EPSPs to another neuron over a brief period of time is called spatial summation .

Correct AnswerverifiedShow Answer

An action potential is propagated down an unmyelinated neuronal plasma membrane because it stimulates voltage-gated ____ channels adjacent to it. (Choose the most accurate answer.)

Correct AnswerverifiedShow Answer

The intensity of an electrical impulse is reflected in the ____ of action potentials.

Correct AnswerverifiedShow Answer

Figure 39.1 -Answer the question using the accompanying figure. At which point in this action potential diagram does the onset of Na+channel inactivation stop the inward flow of Na+?

Correct AnswerverifiedShow Answer

As the action potential peaks, ____.

Correct AnswerverifiedShow Answer

If the equilibrium potential is close to the resting membrane potential, the net ionic movement across the membrane will be very small.

Correct AnswerverifiedShow Answer

Explain how neuron action potential propagation rate can be increased.

In an effort to determine the mechanism of neuronal signaling, Otto Loewi isolated ____.

Correct AnswerverifiedShow Answer

Which neuronal structure has the greatest density of voltage-gated Na+channels, resulting in the lowest threshold potential along a neuron?

Correct AnswerverifiedShow Answer

Most neurons that release GABA and glycine are ____.

Correct AnswerverifiedShow Answer

What is the typical resting potential of an isolated neuron?

Correct AnswerverifiedB

A graded, subthreshold change in the postsynaptic membrane potential that moves it toward threshold is called a(n) ____.

Correct AnswerverifiedShow Answer

Which neurotransmitter is most likely to be inhibitory?

Correct AnswerverifiedShow Answer

Where are most synapses formed?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Oligodendrocytes are responsible for myelinating central nervous system axons.

Correct AnswerverifiedTrue

Which cells assist and nourish neurons that transmit electrical signals?

Correct AnswerverifiedShow Answer

Figure 39.1 -Answer the question using the accompanying figure. At which point in this action potential diagram does the K+channel close to stabilize the membrane potential?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
A resting membrane potential of -70 mV i...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Figure 39.1 -Answer the question using the accompanying figure. At which point in this action potential diagram does the onset of Na⁺channel inactivation stop the inward flow of Na⁺?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which neuronal structure has the greatest density of voltage-gated Na⁺channels, resulting in the lowest threshold potential along a neuron?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
True

Correct Answer
verified

Figure 39.1 -Answer the question using the accompanying figure. At which point in this action potential diagram does the K⁺channel close to stabilize the membrane potential?

Correct Answer
verified