Question 1

Calcium ion entry into the axon terminal is necessary for the release of neurotransmitter into the synaptic cleft.

Accepted Answer

A) True 
 B)False

Question 2

What is more likely to promote an action potential?

Accepted Answer

A)   repolarization
B)   absolute refractory period
C)   hyperpolarization
D)   depolarizationE) None of the above
F) A) and B)

Question 3

Does a local potential guarantee the creation of an action potential? Explain.

Accepted Answer

A local potential must be stro...

Question 4

A local hyperpolarization that changes a postsynaptic neuron's membrane from resting potential to -85 mV is:

Accepted Answer

A)   a saltatory stimulus.
B)   a temporal stimulus.
C)   an inhibitory postsynaptic potential (IPSP) .
D)   an excitatory postsynaptic potential (EPSP) .E) A) and B)
F) B) and C)

Question 5

Branches that may occur along an axon are called:

Accepted Answer

A)   dendrites.
B)   collaterals.
C)   hillocks.
D)   telodendria.E) A) and B)
F) All of the above

Question 6

Relate the speed of conduction of an action potential to myelination.

Accepted Answer

Myelination makes an excellent insulator...

Question 7

What type of ion channels is always open?

Accepted Answer

A)   active
B)   local
C)   leak
D)   regulatedE) A) and B)
F) A) and C)

Question 8

Regeneration of neural tissue in the PNS is possible only if the neuron's cell body remains intact.

Accepted Answer

A) True 
 B)False

Question 9

Kelly takes an antihistamine for allergies. Explain why sleepiness is a side effect of this medicine.

Accepted Answer

Antihistamines are drugs that block hist...

Question 10

When is the generation of an action potential impossible, no matter the strength of the stimulus?

Accepted Answer

A)   absolute refractory period
B)   relative refractory period
C)   depolarization
D)   thresholdE) A) and C)
F) B) and C)

Question 11

A postsynaptic neuron is bombarded by synaptic inputs from several hundred presynaptic neurons.
However, this neuron does not appear to transmit an impulse. Propose an explanation of why this could occur.

Accepted Answer

The input from each presynaptic neuron m...

Question 12

Neurons are responsible for sending and receiving signals referred to as action potentials while neuroglial cells serve a variety of supportive functions.

Accepted Answer

A) True 
 B)False

Question 13

Upon entering your house, you noticed the smell of cake baking in the oven. What division of the peripheral nervous system is responsible?

Accepted Answer

A)   visceral motor division
B)   somatic motor division
C)   visceral sensory division
D)   somatic sensory divisionE) A) and C)
F) B) and D)

Question 14

During repolarization of a neuron:

Accepted Answer

A)   potassium ions move into the cell.
B)   sodium ions move out of the cell.
C)   potassium ions move out of the cell.
D)   sodium ions move into the cell.E) A) and D)
F) All of the above

Question 15

The conduction of an action potential is faster in unmyelinated axons than in myelinated axons.

Accepted Answer

A) True 
 B)False

Question 16

What best describes a converging circuit?

Accepted Answer

A)   One neuron communicates with multiple parts of the brain.
B)   Axon terminals from multiple input neurons join onto a single postsynaptic neuron.
C)   An increasing number of neurons are excited down the pathway of the circuit.
D)   One axon of an input neuron branches to make contact with multiple postsynaptic neurons.E) A) and C)
F) None of the above

Question 17

The autonomic nervous system does NOT carry signals to:

Accepted Answer

A)   cardiac muscle.
B)   smooth muscle.
C)   skeletal muscle.
D)   glands.E) None of the above
F) B) and D)

Question 18

Resting membrane potential is maintained by the Na+/K+ pump which brings:

Accepted Answer

A)   three potassium ions into the cytosol and three sodium ions into the extracellular fluid.
B)   three potassium ions into the cytosol and two sodium ions into the extracellular fluid.
C)   two potassium ions into the cytosol and two sodium ions into the extracellular fluid.
D)   two potassium ions into the cytosol and three sodium ions into the extracellular fluid.E) All of the above
F) C) and D)

Question 19

Explain how leak channels and gated channels differ.

Accepted Answer

Leak channels are always ^openwhile gated cha...

Question 20

A neuron that receives neurotransmitters from another neuron is called:

Accepted Answer

A)   the postsynaptic neuron.
B)   an oligodendrocyte.
C)   the presynaptic neuron.
D)   a Schwann cell.E) All of the above
F) A) and B)

Exam 11: Introduction to the Nervous System Nervous Tissue

Branches that may occur along an axon are called:

Correct AnswerverifiedShow Answer

A local hyperpolarization that changes a postsynaptic neuron's membrane from resting potential to -85 mV is:

Correct AnswerverifiedShow Answer

What type of ion channels is always open?

Correct AnswerverifiedShow Answer

When is the generation of an action potential impossible, no matter the strength of the stimulus?

Correct AnswerverifiedShow Answer

What is more likely to promote an action potential?

Correct AnswerverifiedShow Answer

Calcium ion entry into the axon terminal is necessary for the release of neurotransmitter into the synaptic cleft.

Correct AnswerverifiedShow Answer

Regeneration of neural tissue in the PNS is possible only if the neuron's cell body remains intact.

Correct AnswerverifiedShow Answer

What best describes a converging circuit?

Correct AnswerverifiedShow Answer

The autonomic nervous system does NOT carry signals to:

Correct AnswerverifiedShow Answer

The conduction of an action potential is faster in unmyelinated axons than in myelinated axons.

Correct AnswerverifiedShow Answer

Relate the speed of conduction of an action potential to myelination.

Correct AnswerverifiedMyelination makes an excellent insulator...View AnswerShow Answer

Neurons are responsible for sending and receiving signals referred to as action potentials while neuroglial cells serve a variety of supportive functions.

Correct AnswerverifiedShow Answer

A neuron that receives neurotransmitters from another neuron is called:

Correct AnswerverifiedShow Answer

Upon entering your house, you noticed the smell of cake baking in the oven. What division of the peripheral nervous system is responsible?

Correct AnswerverifiedShow Answer

A postsynaptic neuron is bombarded by synaptic inputs from several hundred presynaptic neurons. However, this neuron does not appear to transmit an impulse. Propose an explanation of why this could occur.

Correct AnswerverifiedThe input from each presynaptic neuron m...View AnswerShow Answer

Does a local potential guarantee the creation of an action potential? Explain.

Correct AnswerverifiedA local potential must be stro...View AnswerShow Answer

Explain how leak channels and gated channels differ.

Correct AnswerverifiedLeak channels are always open while gated cha...View AnswerShow Answer

Resting membrane potential is maintained by the Na+/K+ pump which brings:

Correct AnswerverifiedShow Answer

During repolarization of a neuron:

Correct AnswerverifiedShow Answer

Kelly takes an antihistamine for allergies. Explain why sleepiness is a side effect of this medicine.

Correct AnswerverifiedAntihistamines are drugs that block hist...View AnswerShow Answer

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A local hyperpolarization that changes a postsynaptic neuron's membrane from resting potential to ^-85 mV is:

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Myelination makes an excellent insulator...
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The input from each presynaptic neuron m...
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A local potential must be stro...
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Correct Answer
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Leak channels are always ^openwhile gated cha...
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Resting membrane potential is maintained by the Na⁺/K⁺pump which brings:

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Correct Answer
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Correct Answer
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Antihistamines are drugs that block hist...
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