Question 1

Where are unmyelinated nerve fibers surrounded by Schwann cells?

Accepted Answer

A)  In the PNS
B)  In the CNS
C)  In the PNS and CNS
D)  Nowhere.Unmyelinated nerve fibers are never surrounded by Schwann cells.E) A) and C)
F) B) and C)

Question 2

Which of these does not contribute to the cessation of the signal in a synaptic transmission?

Accepted Answer

A)  Synaptic vesicles secrete neurotransmitter by exocytosis.
B)  Neurotransmitter escapes from the synapse into the nearby extracellular fluid.
C)  Neurotransmitters are no longer released.
D)  The synaptic knob reabsorbs some neurotransmitters by endocytosis.
E)  Enzymes in the postsynaptic cell break down some neurotransmitters.F) A) and E)
G) C) and D)

Question 3

Ependymal cells line the inner cavities of the CNS.

Accepted Answer

A) True 
 B)False

Question 4

Local potentials are __________,whereas action potentials are __________.

Accepted Answer

A)  irreversible; reversible
B)  self-propagating; local
C)  graded; all or none
D)  nondecremental; decremental
E)  produced by voltage-regulated channels; produced by gated channelsF) A) and E)
G) B) and E)

Question 5

Which cells form myelin in the spinal cord?

Accepted Answer

A)  Schwann cells
B)  Astrocytes
C)  Satellite cells
D)  Oligodendrocytes
E)  MicrogliaF) B) and E)
G) A) and D) D

Question 6

Any two EPSPs will override one IPSP.

Accepted Answer

A) True 
 B)False

Question 7

The __________ division carries signals to the smooth muscle in the large intestine.

Accepted Answer

A)  visceral sensory
B)  somatic sensory
C)  visceral motor
D)  somatic motor
E)  afferentF) None of the above
G) All of the above

Question 8

Local potentials are __________,meaning they vary in magnitude according to the strength of the stimulus.

Accepted Answer

A)  stabile
B)  graded
C)  self propagating
D)  excitatory
E)  inhibitoryF) A) and B)
G) C) and E)

Question 9

Acetylcholine triggers the synthesis of the second messenger cAMP only in neurons of the PNS.

Accepted Answer

A) True 
 B)False

Question 10

Most metabolic and regulatory functions in a neuron happen where?

Accepted Answer

A)  The axon
B)  The soma
C)  The dendrites
D)  The axon hillock
E)  The Schwann cellF) C) and E)
G) B) and D)

Question 11

Unipolar neurons have only a single process leading away from the soma.

Accepted Answer

A) True 
 B)False

Question 12

Parkinson disease is a progressive loss of motor function due to the degeneration of specific neurons.These neurons secrete an inhibitory neurotransmitter that prevents excessive activity in motor centers of the brain.What neurotransmitter is this?

Accepted Answer

A)  Serotonin
B)  Dopamine
C)  Acetylcholine
D)  GABA
E)  GlutamateF) A) and B)
G) A) and C) B

Question 13

Which of these happens first in an adrenergic synaptic transmission?

Accepted Answer

A)  ATP is converted to cyclic AMP
B)  Adenylate cyclase is activated
C)  G protein dissociates from the NE receptor
D)  G protein binds to adenylate cyclase
E)  Cyclic AMP induces several effects in the cellF) B) and E)
G) A) and E)

Question 14

If a neuron is prevented from sending a neurotransmitter across a synapse to another cell,which neuron property is being inhibited?

Accepted Answer

A)  Secretion
B)  Excitability
C)  Conductivity
D)  PermeabilityE) A) and D)
F) B) and D) A

Question 15

About 90% of the neurons in the nervous system are __________ neurons.

Accepted Answer

A)  sensory
B)  motor
C)  afferent
D)  efferent
E)  associationF) A) and D)
G) B) and D)

Question 16

Nitric oxide (NO)acts as a neuromodulator by altering synaptic function.

Accepted Answer

A) True 
 B)False

Question 17

The term "nerve fiber" refers to a(n) __________.

Accepted Answer

A)  nerve cell
B)  organelle in nerve cells
C)  organ
D)  axon
E)  bundle of macromolecules in nerve cellsF) None of the above
G) B) and D)

Question 18

What is the opposite of presynaptic inhibition?

Accepted Answer

A)  Coding
B)  Integration
C)  Recruitment
D)  Summation
E)  FacilitationF) A) and D)
G) B) and C)

Question 19

What property of neurons allows them to respond to changes in the environment?

Accepted Answer

A)  Excitablity
B)  Conductivity
C)  Secretion
D)  PermeabilityE) A) and C)
F) None of the above

Question 20

An inhibitory local potential causes which of the following?

Accepted Answer

A)  Depolarization of the plasma membrane
B)  Hyperpolarization of the plasma membrane
C)  Repolarization of the plasma membrane
D)  Neutralization of the plasma membrane
E)  Drifting of the membrane potential towards the resting membrane potentialF) A) and D)
G) C) and E)

Exam 12: Nervous Tissue

Where are unmyelinated nerve fibers surrounded by Schwann cells?

Correct AnswerverifiedShow Answer

Which of these does not contribute to the cessation of the signal in a synaptic transmission?

Correct AnswerverifiedShow Answer

Ependymal cells line the inner cavities of the CNS.

Correct AnswerverifiedShow Answer

Local potentials are __________,whereas action potentials are __________.

Correct AnswerverifiedShow Answer

Which cells form myelin in the spinal cord?

Correct AnswerverifiedD

Any two EPSPs will override one IPSP.

Correct AnswerverifiedShow Answer

The __________ division carries signals to the smooth muscle in the large intestine.

Correct AnswerverifiedShow Answer

Local potentials are __________,meaning they vary in magnitude according to the strength of the stimulus.

Correct AnswerverifiedShow Answer

Acetylcholine triggers the synthesis of the second messenger cAMP only in neurons of the PNS.

Correct AnswerverifiedShow Answer

Most metabolic and regulatory functions in a neuron happen where?

Correct AnswerverifiedShow Answer

Unipolar neurons have only a single process leading away from the soma.

Correct AnswerverifiedShow Answer

Parkinson disease is a progressive loss of motor function due to the degeneration of specific neurons.These neurons secrete an inhibitory neurotransmitter that prevents excessive activity in motor centers of the brain.What neurotransmitter is this?

Correct AnswerverifiedB

Which of these happens first in an adrenergic synaptic transmission?

Correct AnswerverifiedShow Answer

If a neuron is prevented from sending a neurotransmitter across a synapse to another cell,which neuron property is being inhibited?

Correct AnswerverifiedA

About 90% of the neurons in the nervous system are __________ neurons.

Correct AnswerverifiedShow Answer

Nitric oxide (NO)acts as a neuromodulator by altering synaptic function.

Correct AnswerverifiedShow Answer

The term "nerve fiber" refers to a(n) __________.

Correct AnswerverifiedShow Answer

What is the opposite of presynaptic inhibition?

Correct AnswerverifiedShow Answer

What property of neurons allows them to respond to changes in the environment?

Correct AnswerverifiedShow Answer

An inhibitory local potential causes which of the following?

Correct AnswerverifiedShow Answer

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Local potentials are ,whereas action potentials are .

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D

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B

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A

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