Question:
Which substance is not found in normal urine
Which substance is not found in normal urine
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Glucose and large proteins are completely retained by a healthy renal filter. The appearance of glucose (glucosuria) points toward diabetes mellitus or damaged tubular transport systems.
Updated On: Jul 8, 2026
- Glocuse
- creatinine
- Nacl
- Urea
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
The renal glomerulus filters low-molecular-weight substances from blood plasma.
Essential solutes are reabsorbed by specialized transporters along the renal tubules, preventing their excretion in urine.
Step 3: Detailed Explanation:
- Glucose (spelled "Glocuse" in the test paper): It is filtered at the glomerulus but is fully reabsorbed via sodium-glucose cotransporters (SGLT) in the Proximal Convoluted Tubule (PCT). As long as blood glucose remains below the renal threshold (approx. 180 mg/dL), no glucose appears in urine.
- Creatinine: A metabolic byproduct of muscle creatine phosphate that is filtered and excreted without significant tubular reabsorption.
- NaCl and Urea: Metabolic waste products and excess electrolytes that are excreted to maintain fluid and electrolyte homeostasis.
Step 4: Final Answer
Glucose is completely reabsorbed and is absent in normal urine.
The renal glomerulus filters low-molecular-weight substances from blood plasma.
Essential solutes are reabsorbed by specialized transporters along the renal tubules, preventing their excretion in urine.
Step 3: Detailed Explanation:
- Glucose (spelled "Glocuse" in the test paper): It is filtered at the glomerulus but is fully reabsorbed via sodium-glucose cotransporters (SGLT) in the Proximal Convoluted Tubule (PCT). As long as blood glucose remains below the renal threshold (approx. 180 mg/dL), no glucose appears in urine.
- Creatinine: A metabolic byproduct of muscle creatine phosphate that is filtered and excreted without significant tubular reabsorption.
- NaCl and Urea: Metabolic waste products and excess electrolytes that are excreted to maintain fluid and electrolyte homeostasis.
Step 4: Final Answer
Glucose is completely reabsorbed and is absent in normal urine.
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