Nokea
What is the term for the tendency of a drug to combine with its receptor?
- A. potency
- B. efficacy
- C. kinetics
- D. affinity
Correct Answer: D
Rationale: The correct answer is 'affinity.' Affinity refers to the close relationship or mutual attraction between a drug and its receptor, indicating the strength of the drug-receptor bonding. Potency (Choice A) is related to the dose of a drug needed to produce a specific effect. Efficacy (Choice B) refers to a drug's ability to generate the desired effect. Kinetics (Choice C) deals with forces affecting the motion of material bodies or changes in a system, which is not directly associated with the bonding between a drug and its receptor.
You may also like to solve these questions
Which medication might the healthcare provider prescribe if the client expresses discomfort with being in the enclosed space of a CT scanner?
- A. Valium (diazepam)
- B. Clozaril (clozapine)
- C. Catapres (clonidine)
- D. Lasix (furosemide)
Correct Answer: A
Rationale: Valium (diazepam) is a sedative that might be prescribed to help a client who feels uncomfortable in the confined space of a CT scanner. Diazepam can help reduce anxiety and promote relaxation, making the scanning process more tolerable. Clozaril (clozapine), Catapres (clonidine), and Lasix (furosemide) are not sedatives and wouldn't be appropriate for alleviating discomfort related to being in an enclosed space. Clozaril is an antipsychotic used to treat schizophrenia, Catapres is a blood pressure medication, and Lasix is a diuretic used to treat fluid retention, so they are not indicated for this situation.
When the healthcare provider is determining the appropriate size of a nasopharyngeal airway to insert, which body part should be measured on the client?
- A. corner of the mouth to tragus of the ear
- B. corner of the eye to top of the ear
- C. tip of the chin to the sternum
- D. tip of the nose to the earlobe
Correct Answer: D
Rationale: A nasopharyngeal airway is measured from the tip of the nose to the earlobe. This measurement ensures that the airway is of the correct length to reach the nasopharynx without being too long or too short. Choices A, B, and C are incorrect as they do not provide the appropriate measurement for selecting the correct size of a nasopharyngeal airway. The distance from the corner of the mouth to the tragus of the ear (Choice A) is used to measure for an oropharyngeal airway, not a nasopharyngeal airway. Similarly, the other choices (B and C) do not correlate with the correct measurement of a nasopharyngeal airway.
In an emergency situation, the nurse determines whether a client has an airway obstruction. Which of the following does the nurse assess?
- A. ability to speak
- B. ability to hear
- C. oxygen saturation
- D. adventitious breath sounds
Correct Answer: A
Rationale: In an emergency situation, assessing the client's ability to speak is crucial in determining airway obstruction. If a client can speak, it indicates that the airway is patent and not completely obstructed. Choices B and C, assessing the ability to hear and oxygen saturation, are not directly indicative of an airway obstruction. Choice D, adventitious breath sounds, may be present in conditions like asthma or pneumonia but are not specific to determining an airway obstruction.
Which of the following isoenzymes is elevated in a client who has had a myocardial infarction?
- A. CPK-BB
- B. CPK-MM
- C. CPK-MB
- D. CPK-MI
Correct Answer: C
Rationale: CPK-MB is the correct answer as it is elevated in clients who have had a myocardial infarction. CPK-BB is elevated in clients with brain damage, and CPK-MM is elevated in clients with skeletal muscle damage. CPK-MI, mentioned in the rationale, does not exist, making it an incorrect choice.
The healthcare professional seeks to assess the renal function of an elderly client who is about to receive a nephrotoxic medication. Which of the following labs provides the best indicator for renal function?
- A. urinalysis
- B. creatinine and blood urea nitrogen
- C. chemistry of electrolytes
- D. creatinine clearance
Correct Answer: D
Rationale: In the context of an elderly client, assessing renal function before administering a nephrotoxic medication is crucial. While urinalysis and blood urea nitrogen provide valuable information on hydration status and overall health clues, they are not specific indicators of renal function. The chemistry of electrolytes may show abnormalities in renal failure, but it does not directly measure the kidneys' ability to eliminate waste. Creatinine clearance, on the other hand, is considered the best indicator for renal function in the elderly. This test accounts for decreases in lean body mass that can affect blood creatinine levels and is widely used to estimate the glomerular filtration rate, reflecting the kidneys' filtration capability. Therefore, creatinine clearance is the most appropriate lab test to assess renal function in this scenario.