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 B
Explanation
A. Pressure within the renal tubules: This is tubular pressure, which opposes filtration and is not the driving force.
B. Blood pressure: Blood pressure within the glomerular capillaries provides the main hydrostatic pressure driving glomerular filtration.
C. Intrathoracic pressure: This affects respiration and venous return, not glomerular filtration.
D. Intraabdominal pressure: Elevated intraabdominal pressure can impair renal perfusion, but it does not drive filtration.
Correct Answer is B
Explanation
A. Stomach: The stomach primarily functions in mechanical digestion and protein breakdown, but most absorption does not occur here.
B. Duodenum/proximal jejunum: These regions of the small intestine are responsible for majority of digestion and nutrient absorption, including fats, carbohydrates, and proteins.
C. Ascending colon: This is part of the large intestine, mainly involved in water and electrolyte absorption, not digestion.
D. Transverse colon: Like the ascending colon, this structure primarily functions in water absorption and feces formation.
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