Stahl's Essential Psychopharmacology
Neuroscientific Basis and Practical Applications
5th Edition
Author(s)Stephen M. Stahl
TEST BANK
Reference: Ch. 1, Chemical Neurotransmission
Question Stem: A patient with major depressive disorder is
prescribed a medication that increases the amount of
neurotransmitter in the synaptic cleft. The nurse understands
that this medication could achieve its effect through which of
the following mechanisms?
Options:
A) Blocking reuptake pumps on the presynaptic neuron
B) Antagonizing autoreceptors on the presynaptic neuron
C) Degrading enzymes within the synaptic cleft
D) Blocking postsynaptic receptors
Correct Answer: A
Rationales:
• Correct: Blocking reuptake pumps prevents the recycling of
the neurotransmitter back into the presynaptic neuron,
, thereby increasing its concentration and duration of action
in the synaptic cleft. This is the primary mechanism for
many antidepressants, like SSRIs.
• Incorrect B: While antagonizing autoreceptors
can indirectly increase neurotransmitter release, it is not
the most direct mechanism for increasing the amount
already in the cleft. Autoreceptor antagonism increases
the firing rate of the neuron.
• Incorrect C: Degrading enzymes would reduce, not
increase, the amount of neurotransmitter in the synaptic
cleft.
• Incorrect D: Blocking postsynaptic receptors would prevent
the neurotransmitter from binding and having its effect,
functionally decreasing neurotransmission.
Teaching Point: Blocking reuptake is a direct mechanism to
increase synaptic neurotransmitter levels.
Citation: Ch. 1, Chemical Neurotransmission
Reference: Ch. 1, Chemical Neurotransmission
Question Stem: A nursing student is reviewing the function of
ionotropic receptors. Which description by the student best
demonstrates understanding of their primary role?
Options:
A) "They are metabotropic receptors that use G-proteins to
create slow, modulatory effects."
,B) "They are ligand-gated ion channels that mediate fast
synaptic neurotransmission."
C) "They are located primarily on the presynaptic neuron and
regulate neurotransmitter release."
D) "They activate second messenger systems that lead to
changes in gene expression."
Correct Answer: B
Rationales:
• Correct: Ionotropic receptors are ligand-gated ion
channels. When a neurotransmitter binds, the channel
opens immediately, allowing ions to flow and rapidly
change the postsynaptic neuron's membrane potential,
leading to fast excitatory or inhibitory postsynaptic
potentials.
• Incorrect A: This describes metabotropic receptors, not
ionotropic ones.
• Incorrect C: While ionotropic receptors can be presynaptic,
their defining characteristic is not their location but their
function as direct ion channels.
• Incorrect D: This is a function of metabotropic receptors,
which act through second messenger systems.
Teaching Point: Ionotropic receptors are fast ligand-gated
ion channels; metabotropic receptors are slow G-protein
coupled receptors.
Citation: Ch. 1, Chemical Neurotransmission
, Reference: Ch. 1, Chemical Neurotransmission
Question Stem: A patient's medication is described as a "5-
HT2A receptor inverse agonist." The nurse anticipates that this
drug will have which of the following effects?
Options:
A) It will block the receptor, preventing both the
neurotransmitter and agonists from binding.
B) It will activate the receptor to a lesser degree than a full
agonist.
C) It will stabilize the receptor in an inactive conformation,
reducing baseline signaling.
D) It will increase the production of second messengers within
the postsynaptic cell.
Correct Answer: C
Rationales:
• Correct: An inverse agonist not only blocks the receptor
from being activated by agonists but also actively
suppresses any constitutive (baseline) activity the receptor
might have, stabilizing it in an "off" state.
• Incorrect A: This describes a neutral antagonist, which
blocks but does not reduce constitutive activity.
• Incorrect B: This describes a partial agonist.
• Incorrect D: This is the effect of an agonist, not an inverse
agonist.
Neuroscientific Basis and Practical Applications
5th Edition
Author(s)Stephen M. Stahl
TEST BANK
Reference: Ch. 1, Chemical Neurotransmission
Question Stem: A patient with major depressive disorder is
prescribed a medication that increases the amount of
neurotransmitter in the synaptic cleft. The nurse understands
that this medication could achieve its effect through which of
the following mechanisms?
Options:
A) Blocking reuptake pumps on the presynaptic neuron
B) Antagonizing autoreceptors on the presynaptic neuron
C) Degrading enzymes within the synaptic cleft
D) Blocking postsynaptic receptors
Correct Answer: A
Rationales:
• Correct: Blocking reuptake pumps prevents the recycling of
the neurotransmitter back into the presynaptic neuron,
, thereby increasing its concentration and duration of action
in the synaptic cleft. This is the primary mechanism for
many antidepressants, like SSRIs.
• Incorrect B: While antagonizing autoreceptors
can indirectly increase neurotransmitter release, it is not
the most direct mechanism for increasing the amount
already in the cleft. Autoreceptor antagonism increases
the firing rate of the neuron.
• Incorrect C: Degrading enzymes would reduce, not
increase, the amount of neurotransmitter in the synaptic
cleft.
• Incorrect D: Blocking postsynaptic receptors would prevent
the neurotransmitter from binding and having its effect,
functionally decreasing neurotransmission.
Teaching Point: Blocking reuptake is a direct mechanism to
increase synaptic neurotransmitter levels.
Citation: Ch. 1, Chemical Neurotransmission
Reference: Ch. 1, Chemical Neurotransmission
Question Stem: A nursing student is reviewing the function of
ionotropic receptors. Which description by the student best
demonstrates understanding of their primary role?
Options:
A) "They are metabotropic receptors that use G-proteins to
create slow, modulatory effects."
,B) "They are ligand-gated ion channels that mediate fast
synaptic neurotransmission."
C) "They are located primarily on the presynaptic neuron and
regulate neurotransmitter release."
D) "They activate second messenger systems that lead to
changes in gene expression."
Correct Answer: B
Rationales:
• Correct: Ionotropic receptors are ligand-gated ion
channels. When a neurotransmitter binds, the channel
opens immediately, allowing ions to flow and rapidly
change the postsynaptic neuron's membrane potential,
leading to fast excitatory or inhibitory postsynaptic
potentials.
• Incorrect A: This describes metabotropic receptors, not
ionotropic ones.
• Incorrect C: While ionotropic receptors can be presynaptic,
their defining characteristic is not their location but their
function as direct ion channels.
• Incorrect D: This is a function of metabotropic receptors,
which act through second messenger systems.
Teaching Point: Ionotropic receptors are fast ligand-gated
ion channels; metabotropic receptors are slow G-protein
coupled receptors.
Citation: Ch. 1, Chemical Neurotransmission
, Reference: Ch. 1, Chemical Neurotransmission
Question Stem: A patient's medication is described as a "5-
HT2A receptor inverse agonist." The nurse anticipates that this
drug will have which of the following effects?
Options:
A) It will block the receptor, preventing both the
neurotransmitter and agonists from binding.
B) It will activate the receptor to a lesser degree than a full
agonist.
C) It will stabilize the receptor in an inactive conformation,
reducing baseline signaling.
D) It will increase the production of second messengers within
the postsynaptic cell.
Correct Answer: C
Rationales:
• Correct: An inverse agonist not only blocks the receptor
from being activated by agonists but also actively
suppresses any constitutive (baseline) activity the receptor
might have, stabilizing it in an "off" state.
• Incorrect A: This describes a neutral antagonist, which
blocks but does not reduce constitutive activity.
• Incorrect B: This describes a partial agonist.
• Incorrect D: This is the effect of an agonist, not an inverse
agonist.
