Which of the following describes the action of an agonist?
A molecule that prevents receptor activation by other medications
An endogenous molecule or a medication that can activate a receptor
A medication that increases the affinity of a receptor for a different medication
A therapeutic agent that both blocks and activates a receptor
The Correct Answer is B
An agonist is a molecule that can bind to and activate a receptor to induce a biological response ³. Agonists can be endogenous molecules, such as hormones or neurotransmitters, or medications that mimic the action of endogenous agonists ³.
Option A is incorrect because an agonist does not prevent receptor activation by other medications.
Option C is incorrect because an agonist does not increase the affinity of a receptor for a different medication.
Option D is incorrect because an agonist does not both block and activate a receptor.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Alprazolam is a benzodiazepine that is commonly used to treat anxiety disorders and panic disorders ¹. It can also be used as a sleep aid due to its sedative effects ³.
Option A is not correct because paroxetine is an antidepressant and is not commonly used as a sleep aid.
Option B is not correct because buspirone is an anti-anxiety medication and is not commonly used as a sleep aid.
Option D is not correct because amitriptyline is an antidepressant and is not commonly used as a sleep aid.
Correct Answer is D
Explanation
Intravenous (IV) administration of medication involves injecting the medication directly into a vein. This route of administration has the most rapid onset of action because the medication is delivered directly into the bloodstream and can be quickly distributed throughout the body.
Options a, b, and c are not correct because they do not have as rapid an onset of action as intravenous administration. Sublingual administration involves placing the medication under the tongue, where it is absorbed into the bloodstream through the mucous membranes. Intradermal administration involves injecting the medication into the top layer of the skin. Subcutaneous administration involves injecting the medication into the fat tissue just under the skin. While these routes can be effective for delivering medication, they do not have as rapid an onset of action as intravenous administration.
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