Question 1

In order for a severed peripheral nerve to regenerate and recover its original function,nerve fibers must sprout and enter tubes formed by

Accepted Answer

A)  basement membranes and connective tissues.
B)  former axons.
C)  myelin.
D)  nodes of Ranvier.E) None of the above
F) A) and D)

Question 2

Drugs that increase the actions of norepinephrine and/or serotonin by keeping them in synapses longer are most likely used to treat

Accepted Answer

A)  multiple sclerosis.
B)  Tay-Sachs disease.
C)  clinical depression.
D)  erectile dysfunction.E) None of the above
F) C) and D)

Question 3

Masses of myelinated nerve fibers appear

Accepted Answer

A)  white.
B)  gray.
C)  brown.
D)  transparent.E) A) and B)
F) C) and D)

Question 4

A mixed nerve includes different neuroglial cells.

Accepted Answer

A) True 
 B)False

Question 5

A nerve is a single neuron that transmits impulses.

Accepted Answer

A) True 
 B)False

Question 6

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) B) and D)
F) B) and C)

Question 7

Which cells produce myelin in the brain and spinal cord?

Accepted Answer

A)  Schwann cells
B)  Astrocytes
C)  Microglia
D)  OligodendrocytesE) C) and D)
F) All of the above

Question 8

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) A) and D)
F) A) and C)

Question 9

Astrocytes structurally support neurons and also provide important signals and nutrients to neurons.

Accepted Answer

A) True 
 B)False

Question 10

The neurotransmitter that controls skeletal muscle contraction is

Accepted Answer

A)  beta endorphin.
B)  nitric oxide.
C)  acetylcholine.
D)  GABA.E) B) and C)
F) None of the above

Question 11

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) None of the above
F) A) and C)

Question 12

Myelin is rich in ___________.

Accepted Answer

A)  nucleic acids
B)  carbohydrates
C)  lipids
D)  saltsE) C) and D)
F) B) and D)

Question 13

When an action potential passes over the surface of a synaptic knob,the contents of the vesicles are released in response to the presence of

Accepted Answer

A)  calcium ions.
B)  sodium ions.
C)  neurotransmitters.
D)  neuropeptides.E) None of the above
F) A) and D)

Question 14

Dendrites on unipolar neurons are parts of

Accepted Answer

A)  sensory neurons.
B)  motor neurons.
C)  interneurons.
D)  efferent neurons.E) All of the above
F) B) and C)

Question 15

_________ support the axon from within.

Accepted Answer

A)  Dendrites.
B)  Nodes of Ranvier.
C)  Neurofibrils.
D)  Collaterals.E) A) and B)
F) All of the above

Question 16

A stimulus great enough to change the membrane potential and propagate an action potential is said to have reached _________.

Accepted Answer

A)  recruitment
B)  threshold
C)  summation
D)  tetanusE) A) and D)
F) B) and C)

Question 17

A myelinated nerve fiber is ______,whereas an unmyelinated nerve fiber is ______.

Accepted Answer

A)  gray,and composing the gray matter of the brain and spinal cord;white,and composing the white matter of the brain and spinal cord
B)  white,and composing the gray matter of the brain and spinal cord;gray,and composing the white matter of the brain and spinal cord
C)  white,and composing the white matter of the brain and spinal cord;gray,and composing the gray matter of the brain and spinal cord
D)  white,and composing the gray matter of the brain and spinal cord;red,and composing the white matter of the brain and spinal cordE) B) and C)
F) All of the above

Question 18

When a nerve fiber is polarized,the concentration of

Accepted Answer

A)  Na+ and K+ are higher on the inside of the membrane.
B)  Na+ and K+ are higher on the outside of the membrane.
C)  Na+ is higher on the inside of the membrane and K+ is higher on the outside.
D)  Na+ is higher on the outside of the membrane and K+ is higher on the inside.E) C) and D)
F) A) and B)

Question 19

Clusters of neuron cell bodies in the PNS are called _____.

Accepted Answer

A)  neuromas
B)  axons
C)  ganglia
D)  nucleiE) A) and B)
F) B) and C)

Question 20

The functional connection between two neurons is a

Accepted Answer

A)  dendrite.
B)  gap junction.
C)  synapse.
D)  neurotransmitter.E) None of the above
F) A) and B)

Exam 10: Nervous System I

A mixed nerve includes different neuroglial cells.

Correct AnswerverifiedShow Answer

The functional connection between two neurons is a

Correct AnswerverifiedShow Answer

A nerve is a single neuron that transmits impulses.

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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

Myelin is rich in ___________.

Correct AnswerverifiedShow Answer

Which cells produce myelin in the brain and spinal cord?

Correct AnswerverifiedShow Answer

The neurotransmitter that controls skeletal muscle contraction is

Correct AnswerverifiedShow Answer

When an action potential passes over the surface of a synaptic knob,the contents of the vesicles are released in response to the presence of

Correct AnswerverifiedShow Answer

Drugs that increase the actions of norepinephrine and/or serotonin by keeping them in synapses longer are most likely used to treat

Correct AnswerverifiedShow Answer

Drugs that decrease membrane permeability to sodium

Correct AnswerverifiedShow Answer

A myelinated nerve fiber is ______,whereas an unmyelinated nerve fiber is ______.

Correct AnswerverifiedShow Answer

In order for a severed peripheral nerve to regenerate and recover its original function,nerve fibers must sprout and enter tubes formed by

Correct AnswerverifiedShow Answer

Dendrites on unipolar neurons are parts of

Correct AnswerverifiedShow Answer

_________ support the axon from within.

Correct AnswerverifiedShow Answer

Astrocytes structurally support neurons and also provide important signals and nutrients to neurons.

Correct AnswerverifiedShow Answer

When a nerve fiber is polarized,the concentration of

Correct AnswerverifiedShow Answer

The nervous system

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Masses of myelinated nerve fibers appear

Correct AnswerverifiedShow Answer

Clusters of neuron cell bodies in the PNS are called _____.

Correct AnswerverifiedShow Answer

A stimulus great enough to change the membrane potential and propagate an action potential is said to have reached _________.

Correct AnswerverifiedShow Answer

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A myelinated nerve fiber is ,whereas an unmyelinated nerve fiber is .

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