The lowest percentage of body fluids occurs in:
young adults
children
infants
elderly adults
The Correct Answer is D
A. young adults: They have a relatively high percentage of body water (50–60%).
B. children: Children have more body water than adults.
C. infants: Infants have the highest body water content (~70–80%).
D. elderly adults: Aging leads to a decrease in lean body mass and total body water.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Decrease: ADH would increase to help retain water.
B. Not be affected: Fluid loss stimulates ADH secretion.
C. Stay the same: It changes in response to dehydration.
D. Increase: ADH is secreted to conserve water during dehydration caused by vomiting and diarrhea.
Correct Answer is A
Explanation
A. Respiratory system: It responds within minutes by adjusting CO₂ exhalation to regulate pH.
B. Muscular system: It doesn’t play a direct role in acid-base balance.
C. Integumentary system: The skin is not involved in pH regulation.
D. Kidneys and Renal system: Though effective, the renal response is slower, taking hours to days.
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