Question 1

Acetylcholine (ACh) may excite postsynaptic neurons in the CNS; however, it may inhibit some
postsynaptic neurons in the PNS. Explain how acetylcholine can be both excitatory and inhibitory.

Accepted Answer

Acetylcholine can have an excitatory eff...

Question 2

Because of their ability to rapidly divide during brain injury, which type of neuroglial cell would be more likely to form a brain tumor?

Accepted Answer

A)   oligodendrite
B)   ependymal cell
C)   astrocyte
D)   Schwann cellE) B) and C)
F) None of the above

Question 3

Bundles of axons known as tracts are part of the:

Accepted Answer

A)   myelin sheath.
B)   ganglion.
C)   peripheral nervous system.
D)   central nervous system.E) C) and D)
F) A) and B)

Question 4

A series of measurements with a voltmeter show a neuron's membrane potential becoming more negative, from -70 mV to -85 mV. This neuron is experiencing a:

Accepted Answer

A)   polarization phase.
B)   depolarization phase.
C)   repolarization phase.
D)   hyperpolarization phase.E) C) and D)
F) A) and D)

Question 5

Which of the following best describes a bipolar neuron?

Accepted Answer

A)   one axon and multiple, highly branched dendrites
B)   one axon that splits into two processes
C)   multiple axons and one dendrite
D)   one axon and one dendriteE) A) and C)
F) A) and D)

Question 6

The nerve agent, sarin, was developed during World War II to block the effects of acetylcholinesterase. Explain the effects of this nerve agent on the synapse.

Accepted Answer

Acetylcholinesterase (AChE) is an enzyme...

Question 7

Explain the purpose of a neuronal pool.

Accepted Answer

Neuronal pools are networks of interneur...

Question 8

Myelinated axons in the CNS are known as:

Accepted Answer

A)   white matter.
B)   dark matter.
C)   internodes.
D)   gray matter.E) B) and D)
F) C) and D)

Question 9

The autonomic nervous system carries signals to cardiac muscle, smooth muscle, and glands.

Accepted Answer

A) True 
 B)False

Question 10

Determine the direction in which an electrical signal is carried in a typical multipolar neuron.

Accepted Answer

A)   axon, cell body, dendrites
B)   cell body, axon, dendrites
C)   dendrites, cell body, axon
D)   dendrites, axon, cell bodyE) B) and C)
F) A) and D)

Question 11

Neuronal pools are collections of:

Accepted Answer

A)   efferent neurons.
B)   interneurons.
C)   motor neurons.
D)   bipolar neurons.E) B) and C)
F) A) and D)

Question 12

Which of the following is correct about threshold?

Accepted Answer

A)   Threshold is more positive than the resting potential.
B)   The membrane begins to hyperpolarize.
C)   Voltage -gated potassium channels inactivate.
D)   Voltage -gated potassium channels begin to close.E) All of the above
F) A) and C)

Question 13

During depolarization, the membrane potential becomes more positive.

Accepted Answer

A) True 
 B)False

Question 14

Multiple sclerosis (MS) is a disease in which the myelin sheaths are destroyed in the brain and spinal cord. With what process does this interfere and what would be the consequences?

Accepted Answer

Myelin sheaths allow the action potentia...

Question 15

Explain how a polarized neuron differs from a hyperpolarized neuron.

Accepted Answer

A resting neuron is polarized and typica...

Question 16

Summarize the differences between the somatic motor division and the autonomic nervous system.

Accepted Answer

The somatic motor division consists of n...

Question 17

What type of synapse must have receptors to transmit signals?

Accepted Answer

A)   electrical synapse
B)   chemical synapse
C)   both chemical and electrical synapses
D)   neither chemical nor electrical synapsesE) A) and B)
F) All of the above

Question 18

Determine the fiber type in which propagation of an action potential will occur most quickly.

Accepted Answer

A)   myelinated type B fiber
B)   type C fiber
C)   myelinated type A fiber
D)   unmyelinated type B fiberE) All of the above
F) None of the above

Question 19

Which of the following is most likely to produce an action potential?

Accepted Answer

A)   opening of potassium ion channels
B)   hyperpolarization
C)   inhibitory postsynaptic potential (IPSP) 
D)   excitatory postsynaptic potential (EPSP) E) B) and D)
F) B) and C)

Question 20

The two anatomical divisions of the nervous system are the:

Accepted Answer

A)   central nervous system and peripheral nervous system.
B)   sensory division and motor division.
C)   somatic sensory division and visceral sensory system.
D)   visceral motor division and somatic motor division.E) A) and B)
F) B) and C)

Exam 11: Introduction to the Nervous System Nervous Tissue

Which of the following is correct about threshold?

Correct AnswerverifiedShow Answer

Acetylcholine (ACh) may excite postsynaptic neurons in the CNS; however, it may inhibit some postsynaptic neurons in the PNS. Explain how acetylcholine can be both excitatory and inhibitory.

Correct AnswerverifiedAcetylcholine can have an excitatory eff...View AnswerShow Answer

Neuronal pools are collections of:

Correct AnswerverifiedShow Answer

Bundles of axons known as tracts are part of the:

Correct AnswerverifiedShow Answer

During depolarization, the membrane potential becomes more positive.

Correct AnswerverifiedShow Answer

Because of their ability to rapidly divide during brain injury, which type of neuroglial cell would be more likely to form a brain tumor?

Correct AnswerverifiedShow Answer

Explain the purpose of a neuronal pool.

Correct AnswerverifiedNeuronal pools are networks of interneur...View AnswerShow Answer

Which of the following best describes a bipolar neuron?

Correct AnswerverifiedShow Answer

Multiple sclerosis (MS) is a disease in which the myelin sheaths are destroyed in the brain and spinal cord. With what process does this interfere and what would be the consequences?

Correct AnswerverifiedMyelin sheaths allow the action potentia...View AnswerShow Answer

Determine the fiber type in which propagation of an action potential will occur most quickly.

Correct AnswerverifiedShow Answer

Myelinated axons in the CNS are known as:

Correct AnswerverifiedShow Answer

Which of the following is most likely to produce an action potential?

Correct AnswerverifiedShow Answer

Explain how a polarized neuron differs from a hyperpolarized neuron.

Correct AnswerverifiedA resting neuron is polarized and typica...View AnswerShow Answer

The autonomic nervous system carries signals to cardiac muscle, smooth muscle, and glands.

Correct AnswerverifiedShow Answer

The two anatomical divisions of the nervous system are the:

Correct AnswerverifiedShow Answer

The nerve agent, sarin, was developed during World War II to block the effects of acetylcholinesterase. Explain the effects of this nerve agent on the synapse.

Correct AnswerverifiedAcetylcholinesterase (AChE) is an enzyme...View AnswerShow Answer

Determine the direction in which an electrical signal is carried in a typical multipolar neuron.

Correct AnswerverifiedShow Answer

What type of synapse must have receptors to transmit signals?

Correct AnswerverifiedShow Answer

Summarize the differences between the somatic motor division and the autonomic nervous system.

Correct AnswerverifiedThe somatic motor division consists of n...View AnswerShow Answer

A series of measurements with a voltmeter show a neuron's membrane potential becoming more negative, from -70 mV to -85 mV. This neuron is experiencing a:

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Acetylcholine can have an excitatory eff...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Neuronal pools are networks of interneur...
View Answer

Correct Answer
verified

Correct Answer
verified
Myelin sheaths allow the action potentia...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A resting neuron is polarized and typica...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Acetylcholinesterase (AChE) is an enzyme...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The somatic motor division consists of n...
View Answer

A series of measurements with a voltmeter show a neuron's membrane potential becoming more negative, from ^-70 mV to ^-85 mV. This neuron is experiencing a:

Correct Answer
verified