Which phrase describes the function of a buffer?
To excrete weak acids.
To secrete hydrogen ions.
To convert strong acids to weak acids.
To convert ammonia to ammonium ions.
The Correct Answer is C
Choice A rationale:
Buffers do not excrete weak acids; instead, they help regulate the pH of bodily fluids by preventing drastic changes in acidity or alkalinity.
Choice B rationale:
Buffers do not secrete hydrogen ions. In fact, buffers can either absorb or release hydrogen ions to maintain a stable pH.
Choice C rationale:
To convert strong acids to weak acids is the correct answer. Buffers are substances that can neutralize both acids and bases, helping to maintain a stable pH in a solution. They achieve this by accepting hydrogen ions from strong acids or donating hydrogen ions to strong bases, converting them into weaker acids or bases, respectively.
Choice D rationale:
Buffers do not convert ammonia to ammonium ions. This conversion is a part of the body's acid-base regulation system, but it is not the primary function of buffers.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale:
A normal blood pressure reading is typically around 120/80 mm Hg. The given reading of 142/91 mm Hg indicates elevated blood pressure.
Choice B rationale:
Prehypertension is defined as systolic blood pressure between 120-139 mm Hg or diastolic blood pressure between 80-89 mm Hg. The diastolic reading of 91 mm Hg places this patient in the stage 1 hypertension category.
Choice D rationale:
Hypertension, stage 2, is characterized by a systolic blood pressure of 140 mm Hg or higher and a diastolic blood pressure of 90 mm Hg or higher. While the systolic reading meets the criteria, the diastolic reading of 91 mm Hg falls into the stage 1 hypertension category.
Correct Answer is C
Explanation
The correct answer is choice C. Uses an alcohol-based mouthwash twice a day.
Choice A rationale:
Drinking 14 glasses of water daily is generally beneficial as it helps maintain hydration and supports overall health. However, it is important to balance fluid intake to avoid overhydration.
Choice B rationale:
Shaving with an electric razor is recommended for patients with thrombocytopenia because it reduces the risk of cuts and bleeding compared to using a traditional razor.
Choice C rationale:
Using an alcohol-based mouthwash can cause dryness and irritation of the oral mucosa, which can lead to bleeding, especially in patients with thrombocytopenia. It is better to use a non-alcoholic mouthwash.
Choice D rationale:
Brushing teeth with a soft-bristle toothbrush is advised to minimize the risk of gum bleeding and maintain oral hygiene.
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