Question 1

Gaps or interruptions in the myelin sheath are called

Accepted Answer

A)   internodes.
B)   tight junctions.
C)   neurofilaments.
D)   nodes of Ranvier.
E)   gap junctions.F) A) and D)
G) B) and C)

Question 2

Neurons that have a single axon and a single dendrite are

Accepted Answer

A)   tripolar.
B)   bipolar.
C)   multipolar.
D)   pseudo-unipolar.E) C) and D)
F) All of the above

Question 3

A person who has seizures might have a deficit of which of the following?

Accepted Answer

A)   GABA
B)   dopamine
C)   glutamate
D)   serotonin
E)   histamineF) C) and D)
G) B) and C)

Question 4

Dendrites

Accepted Answer

A)   are the input part of the neuron.
B)   conduct action potentials away from the cell body.
C)   are generally long and unbranched.
D)   form synapses with the microglia.
E)   contain the trigger zone.F) A) and E)
G) B) and D)

Question 5

Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?

Accepted Answer

A)   Presynaptic terminals have no acetylcholine receptors.
B)   Presynaptic neurons do not have a resting membrane potential.
C)   Acetylcholine can only diffuse in one direction across the synaptic cleft.
D)   Synaptic vesicles in the postsynaptic membrane are inactive.
E)   Acetylcholine is destroyed too fast.F) B) and C)
G) A) and C)

Question 6

Rapid removal or destruction of neurotransmitter in the synaptic cleft

Accepted Answer

A)   may affect the ability of the postsynaptic membrane to generate action potentials.
B)   generates local potentials in the presynaptic terminal.
C)   is necessary for synaptic transmission.
D)   may lead to action potentials.
E)   may stop exocytosis.F) B) and E)
G) None of the above

Question 7

For the resting membrane potential, increasing the sodium ion concentration in the ECF results in

Accepted Answer

A)   hyperpolarization.
B)   depolarization.
C)   hypopolarization.
D)   little change in membrane potential.
E)   There is not enough information to determine the results.F) B) and E)
G) A) and E)

Question 8

Which of the following is NOT true of reactive astrocytosis?

Accepted Answer

A)   injury site is blocked off
B)   scars limit regeneration
C)   causes the spread of inflammation
D)   reduces injury to surrounding tissueE) A) and D)
F) B) and D)

Question 9

If you cut bundles of axons and their myelin sheaths in the PNS, you cut

Accepted Answer

A)   ganglia.
B)   nuclei.
C)   nerves.
D)   gray matter.
E)   nerve tracts.F) B) and E)
G) C) and D)

Question 10

Sensory neurons carrying action potentials from pain receptors synapse within the spinal cord with interneurons. These interneurons synapse with motor neurons leading back to an effector and ascending neurons that carry action potentials toward the brain. This is an example of a(n)  _____ pathway.

Accepted Answer

A)   convergent
B)   divergent
C)   reverberating
D)   sensory
E)   bifurcatedF) A) and E)
G) A) and B)

Question 11

The division of the nervous system that transmits electrical impulses towards cardiac muscle, smooth muscle and glands is the nervous system.

Accepted Answer

The answer of The division of the nervous system that...

Question 12

____________ are processes that conduct electric signals toward the cell body.
dendrites

Accepted Answer

The answer of ____________ are processes that conduct electric signals...

Question 13

Match the neuroglial cell with its function.
-astrocytes

Accepted Answer

A)  influence function of blood-brain barrier
B)  macrophages in CNS
C)  produce cerebrospinal fluid
D)  form myelin sheath around axons in CNS
E)  form myelin sheath around part of the axon in the PNSF) B) and D)
G) A) and B)

Question 14

Receptor molecules

Accepted Answer

A)   are nonspecific.
B)   are always lipids.
C)   attach to the synaptic cleft.
D)   determine whether a neurotransmitter will be excitatory or inhibitory.
E)   are not attached to ligand-gated channels.F) All of the above
G) D) and E)

Question 15

The junction of a neuron with another cell is a/an

Accepted Answer

A)   synapse.
B)   ganglion.
C)   receptor.
D)   effector.E) A) and D)
F) All of the above

Question 16

Chemical synapses are characterized by

Accepted Answer

A)   the release of neurotransmitter by the presynaptic terminal.
B)   connexons that connect the pre- and postsynaptic cells.
C)   the presence of receptors for neurotransmitters on the presynaptic terminal.
D)   the absence of gap junctions.
E)   receptors located only on the presynaptic terminal.F) All of the above
G) A) and E)

Question 17

Axons contain

Accepted Answer

A)   the trigger zone.
B)   foot processes.
C)   Nissl bodies.
D)   the soma.
E)   the rough endoplasmic reticulum.F) A) and E)
G) A) and D)

Question 18

A neuron that conducts pain sensations to the central nervous system would be classified as a(n)

Accepted Answer

A)   motor neuron.
B)   sensory or afferent neuron.
C)   efferent neuron.
D)   association neuron.
E)   interneuron.F) C) and E)
G) A) and B)

Question 19

When repolarization of a neuron is complete, the

Accepted Answer

A)   neuron dies.
B)   neuron regenerates.
C)   cell no longer has a potential difference across its membrane.
D)   original polarity of the neuron is restored.
E)   neuron is no longer excitable.F) B) and C)
G) A) and B)

Question 20

Synaptic vesicles contain neurotransmitters and are present in the

Accepted Answer

A)   dendrites.
B)   cell body.
C)   axolemma.
D)   presynaptic terminals.
E)   trigger zone.F) B) and D)
G) C) and D)

Exam 11: Functional Organization of Nervous Tissue

When repolarization of a neuron is complete, the

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Axons contain

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Dendrites

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A person who has seizures might have a deficit of which of the following?

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Which of the following is NOT true of reactive astrocytosis?

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Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?

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Chemical synapses are characterized by

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A neuron that conducts pain sensations to the central nervous system would be classified as a(n)

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Sensory neurons carrying action potentials from pain receptors synapse within the spinal cord with interneurons. These interneurons synapse with motor neurons leading back to an effector and ascending neurons that carry action potentials toward the brain. This is an example of a(n) _____ pathway.

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The junction of a neuron with another cell is a/an

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Gaps or interruptions in the myelin sheath are called

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Synaptic vesicles contain neurotransmitters and are present in the

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____________ are processes that conduct electric signals toward the cell body. dendrites

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If you cut bundles of axons and their myelin sheaths in the PNS, you cut

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For the resting membrane potential, increasing the sodium ion concentration in the ECF results in

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Receptor molecules

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Neurons that have a single axon and a single dendrite are

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The division of the nervous system that transmits electrical impulses towards cardiac muscle, smooth muscle and glands is the nervous system.

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Match the neuroglial cell with its function. -astrocytes

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Rapid removal or destruction of neurotransmitter in the synaptic cleft

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