The urine is most likely to be hypotonic when the
body's water volume is high
body's pH is low
output of antidiuretic hormone is high
output of natriuretic peptides is high
person is lost and deprived of drinking water
The Correct Answer is A
A. Body’s water volume is high: When well-hydrated, ADH secretion is low, resulting in dilute (hypotonic) urine as the kidneys excrete excess water.
B. Body’s pH is low: This would affect acid-base balance, not urine tonicity directly.
C. Output of antidiuretic hormone is high: High ADH increases water reabsorption, leading to concentrated (hypertonic) urine.
D. Output of natriuretic peptides is high: These promote Na⁺ and water loss, but hypotonic urine isn't guaranteed.
E. Person is lost and deprived of drinking water: In dehydration, ADH increases, and urine becomes concentrated, not hypotonic.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Buffered hydrogen ions are excreted in urine: This process allows new bicarbonate ions to enter the plasma, helping correct acidosis.
B. Glutamine is metabolized by deamination, oxidation, and acidification: Glutamine metabolism in renal tubule cells generates ammonia and bicarbonate, contributing to acid-base balance.
C. Ammonium ions are excreted in urine: Excreting ammonium (NH₄⁺) removes H⁺ from the body and indirectly adds new bicarbonate to the plasma.
D. Bicarbonate ions are reclaimed by tubular reabsorption: This does not generate new bicarbonate-it simply prevents loss of existing bicarbonate, which is important but not a replenishing mechanism during depletion.
Correct Answer is C
Explanation
A. Cooling of the mouth: This causes temporary inhibition of thirst but does not last long-term.
B. Distension of the stomach by ingested water: Stomach distension contributes to short-term thirst relief.
C. A drop in blood osmolarity: This indicates proper hydration and is the main signal for the hypothalamus to turn off the thirst mechanism.
D. Moistening of the mouth: Like cooling, moistening the mouth only provides short-term relief from thirst.
E. Increased salivation: Increased salivation can be a result of hydration but does not directly regulate thirst.
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