Glucose is not normally excreted in the urine because:
Glucose is used up by the metabolizing nephron units
Glucose cannot be filtered
Glucose is converted to ammonia and excreted as urea
All filtered glucose is reabsorbed
The Correct Answer is D
A. Glucose is used up by the metabolizing nephron units: Nephrons do not metabolize all glucose; their role is to filter and reabsorb.
B. Glucose cannot be filtered: Glucose is a small molecule and is easily filtered by the glomerulus.
C. Glucose is converted to ammonia and excreted as urea: This describes protein metabolism, not glucose.
D. All filtered glucose is reabsorbed: In healthy kidneys, 100% of filtered glucose is reabsorbed in the proximal tubule, so none appears in urine unless blood levels are too high (e.g., diabetes).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Storage: The urinary bladder’s primary function is to store urine until it is excreted during urination.
B. Filtration: Filtration occurs in the glomeruli of the kidneys, not in the bladder.
C. Reabsorption: Reabsorption happens in the renal tubules after filtration in the kidneys.
D. Buffering of H+: Buffering of hydrogen ions occurs in the kidneys and blood, not in the bladder.
Correct Answer is B
Explanation
A. pH 5.0: This is within normal range (urine pH typically ranges from 4.5 to 8.0).
B. Large amount of white blood cells (WBC): A high WBC count in urine indicates possible infection or inflammation, such as a urinary tract infection (UTI), and should be reported.
C. Amber color: Normal urine is straw to amber in color, depending on hydration status. This is not abnormal.
D. Occasional casts: Occasional hyaline casts may be seen in healthy individuals, especially after exercise. Persistent or abnormal casts (e.g., RBC casts) would be more concerning.
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