A student ask the pharmacology instructor to explain the action of anticholinergic agents. What would be the instructor's best response?
They increase norepinephrine at the neuromuscular junction
They act to block the effects of the parasympathetic nervous system
They compete with serotonin for muscarinic acetylcholine receptor sites
They block nicotinic receptors
The Correct Answer is B
A) They increase norepinephrine at the neuromuscular junction: Anticholinergic agents do not directly increase norepinephrine at the neuromuscular junction. Instead, they work by blocking acetylcholine receptors (specifically muscarinic receptors) in the parasympathetic nervous system, which reduces parasympathetic activity. Norepinephrine is primarily involved in the sympathetic nervous system, not the action of anticholinergics.
B) They act to block the effects of the parasympathetic nervous system: This is the correct explanation. Anticholinergic agents work by inhibiting the action of acetylcholine at muscarinic receptors, which are part of the parasympathetic nervous system. By blocking these receptors, anticholinergics reduce parasympathetic effects such as slowing of the heart rate, increased glandular secretions, and smooth muscle contraction, leading to effects like increased heart rate, dry mouth, and bronchodilation.
C) They compete with serotonin for muscarinic acetylcholine receptor sites: Anticholinergic drugs do not interact with serotonin receptors. They specifically target muscarinic acetylcholine receptors, which are involved in parasympathetic responses. Serotonin is a different neurotransmitter, and while some drugs may affect both serotonin and acetylcholine pathways, anticholinergic agents do not compete with serotonin at these receptor sites.
D) They block nicotinic receptors: Anticholinergics typically block muscarinic receptors, not nicotinic receptors. Nicotinic receptors are involved in the transmission of signals at the neuromuscular junction and in the autonomic ganglia, while muscarinic receptors are primarily involved in parasympathetic functions. Blocking nicotinic receptors would have different effects and is not the action of anticholinergic agents.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A) GABA-ergic:
GABA-ergic neurons use gamma-aminobutyric acid (GABA) as their neurotransmitter, not acetylcholine (ACh). GABA is the main inhibitory neurotransmitter in the brain, playing a crucial role in reducing neuronal excitability.
B) Dopaminergic:
Dopaminergic neurons release dopamine as their neurotransmitter. Dopamine is involved in several critical functions, including movement, reward, and regulation of mood. Since acetylcholine is not involved in dopaminergic transmission, this is not the correct answer.
C) Cholinergic:
Cholinergic neurons use acetylcholine (ACh) as their neurotransmitter. These neurons are involved in many functions, including muscle activation (in the somatic nervous system), as well as modulating parasympathetic responses in the autonomic nervous system.
D) Serotonergic:
Serotonergic neurons release serotonin (5-HT), which is a neurotransmitter involved in regulating mood, appetite, sleep, and other functions. Acetylcholine is not involved in serotonergic transmission
Correct Answer is D
Explanation
A) Reversal of bronchoconstriction: Narcotic antagonists are not used to reverse bronchoconstriction. Bronchoconstriction is typically managed with bronchodilators (such as beta-agonists) or corticosteroids. Narcotic antagonists, such as naloxone, specifically counteract the effects of opioids, not respiratory conditions like bronchoconstriction.
B) Reversal of tachycardia: Narcotic antagonists do not have an effect on reversing tachycardia. Tachycardia may result from various conditions, including stimulant use, dehydration, or heart conditions. Treatment for tachycardia typically involves addressing the underlying cause, such as using beta-blockers for cardiac issues, but not narcotic antagonists.
C) Treatment of alcohol dependence: While certain medications, like disulfiram or acamprosate, are used to treat alcohol dependence, narcotic antagonists are not typically indicated for alcohol dependence. Narcotic antagonists, such as naloxone, are primarily used for opioid overdose or dependence, not for alcohol use disorders.
D) Treatment of narcotic dependence: Narcotic antagonists, such as naloxone, are prescribed in the treatment of narcotic (opioid) dependence. These medications work by blocking the effects of opioids at the receptor sites, thereby preventing the "high" associated with opioid use. They are particularly useful in treating opioid overdoses and can also be used in the management of opioid addiction as part of a comprehensive treatment plan.
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