A nurse educator is teaching pharmacokinetics to the pharmacology class. What statement, made by a student, would show the class understands this term?
1. "Pharmacokinetics is what the body does to a drug."
2. "Pharmacokinetics is how drugs activate specific receptors."
3. "Pharmacokinetics is what a drug does to the body."
4. "Pharmacokinetics is the efficacy of a drug."
Correct Answer: 1
Rationale 1: Pharmacokinetics describes how the body absorbs, distributes, metabolizes, and excretes drugs.
Rationale 2: Pharmacokinetics is how drugs activate specific receptors is incorrect because drug–receptor interactions describe, in part, what effects a drug has on the body, and thus are considered part of pharmacodynamics.
Rationale 3: Pharmacokinetics is what a drug does to the body is incorrect because pharmacodynamics is the term that describes what effects a drug has on the body.
Rationale 4: Pharmacokinetics is the efficacy of a drug is incorrect because efficacy is a pharmacodynamic concept.
Global Rationale: Pharmacokinetics describes how the body absorbs, distributes, metabolizes, and excretes drugs. Pharmacokinetics is how drugs activate specific receptors is incorrect because drug—receptor interactions describe, in part, what effects a drug has on the body, and thus are considered part of pharmacodynamics. Pharmacokinetics is what a drug does to the body is incorrect because pharmacodynamics is the term that describes what effects a drug has on the body. Pharmacokinetics is the efficacy of a drug is incorrect because efficacy is a pharmacodynamic concept.
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