Question 1

Diverging axons amplify an impulse by

Accepted Answer

A)   contacting many neurons.
B)   returning the impulse to the neuron of origin.
C)   splitting into multiple axons.
D)   stimulating themselves.E) A) and B)
F) None of the above

Question 2

Myelin

Accepted Answer

A)   is released from a neuron and travels to another neuron.
B)   consists of layers of lipids and proteins that wrap around an axon.
C)   is produced in response to bacterial infection.
D)   is a form of chromatophilic substance that fills Schwann cells.E) All of the above
F) C) and D)

Question 3

What is the correct sequence of events along an axon that follows a membrane reaching threshold potential? 1. The membrane depolarizes.
2)  Sodium channels open and sodium ions diffuse inward.
3)  The membrane repolarizes.
4)  Potassium channels open and potassium ions diffuse outward.

Accepted Answer

A)   3, 2, 4, 1
B)   2, 1, 4, 3
C)   1, 2, 4, 3
D)   4, 1, 3, 2E) All of the above
F) C) and D)

Question 4

The nervous system

Accepted Answer

A)   detects changes in the internal or external environment.
B)   controls the movement of muscles.
C)   integrates information from several sources and uses it to determine an appropriate response.
D)   all of the above.E) A) and B)
F) A) and C)

Question 5

Most of the neurons in the brain and spinal cord are

Accepted Answer

A)   bipolar.
B)   unipolar
C)   multipolar.
D)   nonpolar.E) None of the above
F) A) and B)

Question 6

Because the response of a nerve fiber is all-or-none, a greater intensity of stimulus does not produce a stronger impulse.

Accepted Answer

A) True 
 B)False

Question 7

In reuptake

Accepted Answer

A)   an action potential reverses direction.
B)   a neuropeptide breaks down into amino acids, which act as neurotransmitters.
C)   a neurotransmitter that has already been released into the synaptic cleft is taken back into the synaptic knob of the presynaptic neuron or into nearby neuroglia or neurons.
D)   an enzyme breaks down a neurotransmitter and then another enzyme builds it back up.E) All of the above
F) A) and B)

Question 8

Nodes of Ranvier lie between neurons.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following neuroglia are not part of the CNS?

Accepted Answer

A)   Ependymal cells
B)   Astrocytes
C)   Satellite cells
D)   MicrogliaE) B) and C)
F) All of the above

Question 10

Several nerve fibers converging onto one neuron amplifies impulses.

Accepted Answer

A) True 
 B)False

Question 11

The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are

Accepted Answer

A)   neurofibrils.
B)   chromatophilic substance (Nissl bodies) .
C)   axons.
D)   dendrites.E) A) and D)
F) B) and C)

Question 12

In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers.

Accepted Answer

A) True 
 B)False

Question 13

The neurotransmitter that controls skeletal muscle contraction is

Accepted Answer

A)   beta endorphin.
B)   nitric oxide.
C)   acetylcholine.
D)   GABA.E) B) and D)
F) A) and B)

Question 14

Every neuron has

Accepted Answer

A)   many axons.
B)   a cell body.
C)   myelin.
D)   a neurilemma.E) All of the above
F) A) and B)

Question 15

A nerve is a single neuron that transmits impulses.

Accepted Answer

A) True 
 B)False

Question 16

A nerve cell membrane becomes depolarized as a result of

Accepted Answer

A)   calcium leaving the nerve cell.
B)   some ion channels being opened while others are closed.
C)   the relative ease with which K+ diffuses into the nerve cell.
D)   Na+ being prevented from passing through the membrane.E) A) and D)
F) A) and C)

Question 17

Drugs that decrease membrane permeability to sodium

Accepted Answer

A)   are used as local anesthetics.
B)   prevent nerve impulses from passing through the affected body part.
C)   lessen pain.
D)   all of the above.E) None of the above
F) All of the above

Question 18

Three general functions of the nervous system are

Accepted Answer

A)   sensory, motor, and predictive.
B)   integrative, motor, and sensory.
C)   predictive, manipulative, and integrative.
D)   reflexive, sensory, and predictive.E) B) and C)
F) B) and D)

Question 19

If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called ______ ______ ______.

Accepted Answer

inhibitory...

Question 20

Muscles and glands that respond to nervous stimulation are called _______.

Accepted Answer

The answer of Muscles and glands that respond to nervous...

Exam 10: Nervous System I: Basic Structure and Function

Which of the following neuroglia are not part of the CNS?

Correct AnswerverifiedShow Answer

What is the correct sequence of events along an axon that follows a membrane reaching threshold potential? 1. The membrane depolarizes. 2) Sodium channels open and sodium ions diffuse inward. 3) The membrane repolarizes. 4) Potassium channels open and potassium ions diffuse outward.

Correct AnswerverifiedShow Answer

Three general functions of the nervous system are

Correct AnswerverifiedShow Answer

In reuptake

Correct AnswerverifiedShow Answer

Every neuron has

Correct AnswerverifiedShow Answer

Most of the neurons in the brain and spinal cord are

Correct AnswerverifiedShow Answer

The neurotransmitter that controls skeletal muscle contraction is

Correct AnswerverifiedShow Answer

Nodes of Ranvier lie between neurons.

Correct AnswerverifiedShow Answer

A nerve is a single neuron that transmits impulses.

Correct AnswerverifiedShow Answer

Several nerve fibers converging onto one neuron amplifies impulses.

Correct AnswerverifiedShow Answer

In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers.

Correct AnswerverifiedShow Answer

Drugs that decrease membrane permeability to sodium

Correct AnswerverifiedShow Answer

Muscles and glands that respond to nervous stimulation are called _______.

Correct AnswerverifiedShow Answer

A nerve cell membrane becomes depolarized as a result of

Correct AnswerverifiedShow Answer

Because the response of a nerve fiber is all-or-none, a greater intensity of stimulus does not produce a stronger impulse.

Correct AnswerverifiedShow Answer

Myelin

Correct AnswerverifiedShow Answer

The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are

Correct AnswerverifiedShow Answer

If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called ______ ______ ______.

Correct Answerverifiedinhibitory...View AnswerShow Answer

Diverging axons amplify an impulse by

Correct AnswerverifiedShow Answer

The nervous system

Correct AnswerverifiedShow Answer

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If a neurotransmitter hyperpolarizes a cell membrane and an action potential is less likely, the change is called __.

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inhibitory...
View Answer

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Correct Answer
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