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 B
Explanation
An allosteric modulator is a medication that binds to a specific receptor at a site different from the binding site for endogenous ligands.Allosteric modulators can affect receptor activity by enhancing or inhibiting the binding or activity of endogenous ligands.
a.An allosteric modulator binds to a different site from endogenous ligands,not the same site.
c.An allosteric modulator affects receptor activity indirectly by enhancing or inhibiting the binding or activity of endogenous ligands.
d.Allosteric modulation affects pharmacodynamics by altering receptor activity through indirect mechanisms.
Correct Answer is C
Explanation
Additive effects occur when two drugs produce similar effects and their combined effect is equal to sum of their individual effects.When administering two drugs with additive effects,the nurse should consider their combined effect and adjust dosing accordingly.
a.Additive effects occur when two drugs produce similar effects and their combined effect is equal to sum of their individual effects
b.Additive effects occur when two drugs produce similar effects and their combined effect is equal to sum of their individual effects
d.Additive effects affect pharmacodynamics by determining how two drugs interact when given together
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