A nurse is preparing to administer a medication that acts as an antagonist at a specific receptor. What effect will this medication have?
It will increase the activity of the receptor.
It will decrease the activity of the receptor.
It will have no effect on the activity of the receptor.
It will block the activity of the receptor.
The Correct Answer is D
An antagonist is a medication that binds to a specific receptor and blocks its activation, preventing other medications or endogenous ligands from activating it. A medication that acts as an antagonist at a specific receptor will block the activity of that receptor.
a. An antagonist blocks, not increases, the activity of the receptor it binds to.
b. An antagonist does not directly decrease the activity of the receptor it binds to but prevents its activation by other medications or endogenous ligands.
c. An antagonist has an effect on the activity of the receptor it binds to by blocking its activation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
An agonist is a medication that binds to a specific receptor and activates it, increasing its activity. A medication that acts as an agonist at a specific receptor will increase the activity of that receptor.
b. An agonist increases, not decreases, the activity of the receptor it binds to.
c. An agonist has an effect on the activity of the receptor it binds to by increasing its activity.
d. An agonist activates, not blocks, the activity of the receptor it binds to.
Correct Answer is B
Explanation
Therapeutic index refers to the ratio between the toxic dose and the therapeutic dose of a drug.A drug with a low therapeutic index has a narrow margin of safety,meaning that the difference between its toxic and therapeutic doses is small.When administering a drug with a low therapeutic index,the nurse should carefully monitor the client for signs of toxicity.
a.A drug with a low therapeutic index has a narrow margin of safety,meaning that the difference between its toxic and therapeutic doses is small
c.A drug with a low therapeutic index has a narrow margin of safety,meaning that the difference between its toxic and therapeutic doses is small
d.Therapeutic index affects pharmacodynamics by determining the margin of safety between the toxic and therapeutic doses of a drug
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