MSN 671 : Psychopathopharmacology I - NKU Module 4 quiz 6
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Free MSN 671 : Psychopathopharmacology I - NKU Module 4 quiz 6 Questions
Blocking histamine H1 receptors interferes with histamine’s wake-promoting actions. What is the clinical effect of this mechanism?
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Improved alertness and concentration
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Sedation and drowsiness, sometimes used as a sleep aid
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Enhanced gastric acid secretion for digestion
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Increased motor activity and vigilance
Explanation
Correct Answer:
B. Sedation and drowsiness, sometimes used as a sleep aid
Explanation of Correct Answer
Histamine acting at H1 receptors promotes wakefulness and alertness in the brain. When H1 receptors are blocked, as with first-generation antihistamines (e.g., diphenhydramine, hydroxyzine), this disrupts histamine’s arousal function, producing sedation, drowsiness, and sleepiness. This is why some antihistamines are marketed as over-the-counter sleep aids. However, the downside is next-day grogginess and impaired alertness due to their relatively long half-lives and anticholinergic effects.
Donepezil (Aricept) is best described as which type of medication mechanism?
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Irreversible acetylcholinesterase inhibitor that works peripherally to increase ACh levels
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Reversible selective acetylcholinesterase (AChE) inhibitor that works centrally to increase ACh levels
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Dopamine receptor agonist that restores mesolimbic function
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NMDA receptor antagonist that reduces glutamate excitotoxicity
Explanation
Correct Answer:
B. Reversible selective acetylcholinesterase (AChE) inhibitor that works centrally to increase ACh levels
Explanation of Correct Answer
Donepezil (Aricept) is a reversible and selective acetylcholinesterase inhibitor that acts centrally in the brain. By blocking the enzyme acetylcholinesterase, it prevents the breakdown of acetylcholine (ACh), thereby increasing synaptic ACh levels. This enhances cholinergic neurotransmission, which is critical in treating cognitive symptoms of Alzheimer’s disease, where cholinergic deficits are a hallmark.
Adenosine's effects contribute to increased ____, the primary inhibitory neurotransmitter in the brain, which is essential in suppressing arousal systems.
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Dopamine
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GABA
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Acetylcholine
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Histamine
Explanation
Correct Answer:
B. GABA
Explanation of Correct Answer
GABA (gamma-aminobutyric acid) is the brain’s primary inhibitory neurotransmitter. As adenosine accumulates with prolonged wakefulness, it enhances GABAergic activity, particularly in the ventrolateral preoptic nucleus (VLPO). This suppresses arousal-promoting neurotransmitters such as histamine, norepinephrine, dopamine, and acetylcholine, leading to sleep initiation and maintenance. GABA’s inhibitory action is central to the homeostatic drive to sleep.
Why should the orexin receptor antagonist suvorexant be used with caution or avoided in some patients?
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It causes significant gastric acid secretion and peptic ulcers
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It worsens motor symptoms in Parkinson’s disease
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It may cause next-day somnolence, impaired driving, and carries abuse potential
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It blocks serotonin receptors, leading to severe depression
Explanation
Correct Answer:
C. It may cause next-day somnolence, impaired driving, and carries abuse potential
Explanation of Correct Answer
Suvorexant, a dual orexin receptor antagonist (DORA), is used for insomnia by suppressing wake-promoting orexin signals. However, it can cause residual next-day drowsiness, impaired alertness, and driving difficulty, especially if taken late at night or with insufficient sleep opportunity. Additionally, as a controlled substance, suvorexant carries some abuse and dependence potential, requiring careful monitoring. These risks make it unsuitable for some patients, particularly those with safety-sensitive jobs.
Which statement best explains the role of melatonin in sleep regulation?
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Melatonin is a neurotransmitter that directly inhibits acetylcholine to promote non-REM sleep.
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Melatonin is secreted from the pineal gland and signals the circadian system to promote sleep at night.
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Melatonin is released in proportion to adenosine accumulation, driving the homeostatic sleep pressure
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Melatonin acts as an orexin antagonist to stabilize transitions between sleep and wakefulness.
Explanation
Correct Answer:
B. Melatonin is secreted from the pineal gland and signals the circadian system to promote sleep at night.
Explanation of Correct Answer
Melatonin is a hormone secreted by the pineal gland under control of the suprachiasmatic nucleus (SCN). Its release is tied to darkness and helps synchronize the circadian rhythm, signaling to the body that it is time to prepare for sleep. Unlike adenosine, which drives the homeostatic sleep pressure, melatonin regulates the timing of sleep. Together, adenosine and melatonin ensure both the need and the timing for sleep are met.
Which of the following symptom clusters is most characteristic of sleep apnea?
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Difficulty falling asleep, sleepwalking, vivid dreams, and restless legs
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Loud snoring, frequent nocturnal awakenings, excessive daytime sleepiness, morning headaches, memory and cognitive problems, irritability
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Early morning awakenings, depressed mood, poor appetite, and low energy
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Nightmares, hypervigilance, flashbacks, and exaggerated startle response
Explanation
Correct Answer:
B. Loud snoring, frequent nocturnal awakenings, excessive daytime sleepiness, morning headaches, memory and cognitive problems, irritability
Explanation of Correct Answer
Sleep apnea is a sleep-related breathing disorder marked by repeated airway obstruction during sleep. Its hallmark features include loud snoring, frequent awakenings at night, and excessive daytime sleepiness due to fragmented sleep. Additional symptoms include morning headaches, memory/cognitive impairment, and irritability from chronic sleep disruption and intermittent hypoxia. Recognizing these symptoms is essential for screening and referral for sleep studies.
The PMHNP has a 27-year-old male that returns to the clinic for a follow-up. The patient has a documented history of substance abuse. The patient has reported sobriety for 1 month. The patient newly reports lack of sleeping and requesting a sleep aid. As the PMHNP you complete an assessment to include sleep hygiene and determine that the patient may benefit from a sleep aid. The patient reports that Benadryl and Melatonin have been ineffective. Which of the following sleep aids may be trialed first for this patient. Select all that applies:
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Suvorexant
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Trazodone
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Lemborexant
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Zolpidem
Explanation
Correct Answer:
B. Trazodone
Explanation of Correct Answer
B. Trazodone
Trazodone is often considered first-line in patients with a history of substance abuse because it is a non-habit-forming antidepressant with sedative effects. It carries a much lower risk of abuse compared to other hypnotics such as zolpidem or orexin antagonists. For a patient with early recovery from substance use, avoiding medications with addictive potential is essential. Trazodone offers both safety and effectiveness, making it the most appropriate option in this scenario.
Which combination best represents the underlying pathological mechanisms of Alzheimer’s disease?
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Excess serotonin, dopamine imbalance, and tau protein clearance
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Loss of acetylcholine, amyloid plaques, neurofibrillary tangles, and glutamate excitotoxicity
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Reduced norepinephrine, increased GABA, and myelin sheath degeneration
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Elevated histamine, iron accumulation, and cortical thinning
Explanation
Correct Answer:
B. Loss of acetylcholine, amyloid plaques, neurofibrillary tangles, and glutamate excitotoxicity
Explanation of Correct Answer
Alzheimer’s disease arises from multiple pathological mechanisms. The loss of acetylcholine impairs cholinergic neurotransmission, leading to memory and cognitive decline. Amyloid-beta plaques accumulate extracellularly, disrupting neural signaling, while neurofibrillary tangles composed of hyperphosphorylated tau damage intracellular transport. The glutamate hypothesis adds that excessive activation of NMDA receptors causes excitotoxicity and neuronal death. Together, these processes drive progressive neurodegeneration.
............................................................. is one of the key neurotransmitters that regulates wakefulness and is the ultimate target of many wake-promoting drugs when enhanced and sleep-promoting drugs when blocked.
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Prolactin
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Histamine
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Acetylcholine
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Dopamine
Explanation
Correct Answer:
B. Histamine
Explanation of Correct Answer
Histamine, released from neurons in the tuberomammillary nucleus of the hypothalamus, plays a central role in promoting wakefulness. When histamine activity is enhanced, it stimulates arousal, which is why histamine agonists or stimulants support wakefulness. Conversely, blocking histamine receptors (as with many antihistamines) promotes drowsiness and sleep, making histamine the ultimate neurotransmitter target for both sleep- and wake-promoting drugs.
When histamine binds to postsynaptic histamine 1 (H1) receptors, it activates a G-protein-linked second-messenger system that activates phosphatidylinositol (PI) and the transcription factor cFOS. This process results in what actions?
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Drowsiness and normal sleep
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Wakefulness and normal alertness
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Hyperarousal with hypervigilance
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Difficulty with sleep with hyperarousal
Explanation
Correct Answer:
B. Wakefulness and normal alertness
Explanation of Correct Answer
Histamine binding to H1 receptors promotes wakefulness and alertness. The activation of the G-protein-linked second messenger system with phosphatidylinositol and cFOS increases neuronal excitability and supports cortical arousal. This mechanism is why histamine activity is essential for maintaining normal daytime alertness and why H1 receptor antagonists (antihistamines) often cause sedation by blocking this pathway.
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