A nurse asks her mentor to identify the term describing a drug's ability to bind to a particular receptor site. The mentor knows that which is the most appropriate response?
1. Affinity
2. Selectivity
3. Intrinsic activity
4. Hyperosmolarity
Answer: 2
Explanation: The drug's ability to bind to a particular receptor site is referred to as its selectivity. Affinity refers to how strong an interest or attraction a drug might have for a particular receptor. The drug's ability to produce a response once it has been bound or attached itself to the receptor is called its intrinsic activity. Hyperosmolarity refers to particularly high concentrations of a substance.
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