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Local Anesthesia Midterm Questions with 100%
Verified Answers 2025 | 2026
All of the following are true regarding the nodes of Ranvier
EXCEPT one? Which one is the EXCEPTION?
a. Found along myelinated nerve fibers between adjacent
Schwann cells
b. Occur at unevenly spaced intervals
c. Where action potential conduction occurs
d. Where myelinated axon has direct contact with the
extracellular space - ANSWER c. Where action potential
conduction occurs
The lipoprotein sheath that surrounds many neurons is called
the myelin sheath. The myelin sheath is composed of Schwann
cells.
a. Both statements are true.
b. Both statements are false.
c. The first statement is true; the second statement is false.
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d. The first statement is false; the second statement is true. -
ANSWER a. Both statements are true.
The relationship between relative amounts of ions inside and
outside the nerve membrane is known as which of the
following?
a. Relative refractory period
b. Concentration gradient
c. Action potential
d. Axolemma - ANSWER b. Concentration gradient
The axon is
a. made up of cytoplasm.
b. surrounded by a multiple lipid membrane.
c. All options listed.
d. None of the options listed. - ANSWER c. All options listed.
What is the name of the portion of the sensory neuron that is
easily excited and has the most negative action potential
threshold?
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a. Dendritic zone
b. Soma
c. Axon hillock
d. Output zone - ANSWER c. Axon hillock
Local anesthetic agents used in dentistry do all of the following
EXCEPT one. Which one is the EXCEPTION?
a. Cause loss of nociception
b. Prevent generation of a nerve impulse
c. Prevent conduction of a nerve impulse
d. Prevent repolarization - ANSWER d. Prevent repolarization
As the action potential moves down the line, its strength
decreases as it moves from one neuron to the next. The action
potential in myelinated axons does not propagate as waves as in
unmyelinated axons.
a. Both statements are true.
b. Both statements are false.
c. The first statement is true; the second statement is false.
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d. The first statement is false; the second statement is true. -
ANSWER d. The first statement is false; the second statement is
true.
What factor/factors determine the severity of an overdose
reaction to local anesthetic?
a. Degree of drop in blood pressure
b. Time lapse between the administering of the local anesthetic
to the overdose
c. Number of symptoms patient experiences
d. All options listed - ANSWER b. Time lapse between the
administering of the local anesthetic to the overdose
Why do you think Sam's blood pressure decreased from the
beginning of the appointment?
a. Sam became more comfortable during the appointment.
b. Symptoms of a CNS and CVS overdose are biphasic.
c. Symptoms of a possible overdose change from a stimulation
phase to a depression phase.
d. All options listed. - ANSWER d. All options listed.
Local Anesthesia Midterm Questions with 100%
Verified Answers 2025 | 2026
All of the following are true regarding the nodes of Ranvier
EXCEPT one? Which one is the EXCEPTION?
a. Found along myelinated nerve fibers between adjacent
Schwann cells
b. Occur at unevenly spaced intervals
c. Where action potential conduction occurs
d. Where myelinated axon has direct contact with the
extracellular space - ANSWER c. Where action potential
conduction occurs
The lipoprotein sheath that surrounds many neurons is called
the myelin sheath. The myelin sheath is composed of Schwann
cells.
a. Both statements are true.
b. Both statements are false.
c. The first statement is true; the second statement is false.
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d. The first statement is false; the second statement is true. -
ANSWER a. Both statements are true.
The relationship between relative amounts of ions inside and
outside the nerve membrane is known as which of the
following?
a. Relative refractory period
b. Concentration gradient
c. Action potential
d. Axolemma - ANSWER b. Concentration gradient
The axon is
a. made up of cytoplasm.
b. surrounded by a multiple lipid membrane.
c. All options listed.
d. None of the options listed. - ANSWER c. All options listed.
What is the name of the portion of the sensory neuron that is
easily excited and has the most negative action potential
threshold?
,3|Page
a. Dendritic zone
b. Soma
c. Axon hillock
d. Output zone - ANSWER c. Axon hillock
Local anesthetic agents used in dentistry do all of the following
EXCEPT one. Which one is the EXCEPTION?
a. Cause loss of nociception
b. Prevent generation of a nerve impulse
c. Prevent conduction of a nerve impulse
d. Prevent repolarization - ANSWER d. Prevent repolarization
As the action potential moves down the line, its strength
decreases as it moves from one neuron to the next. The action
potential in myelinated axons does not propagate as waves as in
unmyelinated axons.
a. Both statements are true.
b. Both statements are false.
c. The first statement is true; the second statement is false.
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d. The first statement is false; the second statement is true. -
ANSWER d. The first statement is false; the second statement is
true.
What factor/factors determine the severity of an overdose
reaction to local anesthetic?
a. Degree of drop in blood pressure
b. Time lapse between the administering of the local anesthetic
to the overdose
c. Number of symptoms patient experiences
d. All options listed - ANSWER b. Time lapse between the
administering of the local anesthetic to the overdose
Why do you think Sam's blood pressure decreased from the
beginning of the appointment?
a. Sam became more comfortable during the appointment.
b. Symptoms of a CNS and CVS overdose are biphasic.
c. Symptoms of a possible overdose change from a stimulation
phase to a depression phase.
d. All options listed. - ANSWER d. All options listed.
