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 D
Explanation
Donepezil is a medication that can cause side effects such as dizziness and fainting ¹. Therefore, it is important for the client to rise slowly from a lying or sitting position to prevent falls.
Option A is incorrect because donepezil can be taken with or without food.
Option B is incorrect because donepezil does have side effects ¹.
Option C is incorrect because the health care provider added donepezil to the client's daily routine, not to replace carbidopa/levodopa.
Correct Answer is C
Explanation
Traditional antipsychotics can increase tremors in people with Parkinson's disease ¹. These medications can block dopamine receptors in the brain, which can worsen Parkinson's symptoms ¹.
Option A is not correct because beta-blockers are not known to increase tremors in Parkinson's disease.
Option B is not correct because non-steroidal anti-inflammatory drugs (NSAIDs) are not known to increase tremors in Parkinson's disease.
Option D is not correct because barbiturates are not known to increase tremors in Parkinson's disease.
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