Three body systems work at different speeds to keep the pH in the narrow range of normal, The order of effectiveness for these three systems is:
kidneys, lungs, blood/chemical buffers
chemical buffers, kidneys, lungs
lungs, kidneys, and blood/chemical buffers
blood/chemical buffers, lungs, kidneys
The Correct Answer is D
Rationale:
A. Kidneys are the slowest to respond, so this order is incorrect.
B. Kidneys are slower than lungs, so this order is incorrect.
C. Lungs respond faster than kidneys but slower than chemical buffers, so this order is incorrect.
D. Chemical buffers act immediately to neutralize pH changes (first line), lungs adjust CO₂ levels within minutes (second line), and kidneys regulate acid-base balance over hours to days (third line), making this the correct order.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Rationale:
A. While sodium bicarbonate can help mitigate some cardiac effects of hyperkalemia, this is not its primary indication.
B. Sodium bicarbonate may be used as an adjunct in hyperkalemia but not as a direct treatment.
C. Sodium bicarbonate does not treat hyponatremia.
D. Sodium bicarbonate is primarily used to neutralize excess acid in the blood and manage metabolic acidosis by increasing blood pH.
Correct Answer is C
Explanation
Rationale:
A. Taking magnesium oxide on an empty stomach can cause gastrointestinal irritation; it’s best taken with food or water.
B. Coffee can interfere with absorption of some medications and may worsen GI upset; it's not recommended.
C. Drinking a full glass of water helps ensure proper dissolution and absorption of the medication and minimizes GI side effects.
D. Crushing magnesium oxide tablets is not recommended unless specifically directed, as some formulations are meant to be swallowed whole.
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