Renal Function Testing and NPN Substances
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Questions and Answers

What is the primary function of the nephron in relation to non-protein nitrogenous substances?

  • Ultra-filtration at the glomerulus (correct)
  • Secretion of erythropoietin
  • Activation of vitamin D
  • Metabolism of foreign chemicals
  • Which condition is characterized by an excess of urea or other nitrogenous compounds in the blood?

  • Glomerulonephritis
  • Diabetic insipidus
  • Azotemia (correct)
  • Renal hypertension
  • Which hormone is important for the reabsorption of water from the kidneys?

  • Antidiuretic hormone (correct)
  • Erythropoietin
  • Angiotensinogen
  • Renin
  • Which NPN compound is present in the highest concentration in blood and urine?

    <p>Blood urea nitrogen (BUN)</p> Signup and view all the answers

    Which method of urea measurement is considered an 'indirect' method?

    <p>Enzymatic (indirect) method</p> Signup and view all the answers

    Which NPN compound is formed spontaneously from creatine in muscle and excreted into urine through glomerular filtration?

    <p>Creatinine</p> Signup and view all the answers

    Which of the following substances is not normally found in the filtrate due to its large molecular weight?

    <p>Protein-bound substances</p> Signup and view all the answers

    What is the renal threshold plasma concentration for glucose?

    <p>~160-180 mg/dl</p> Signup and view all the answers

    Which of the following waste products is primarily regulated through tubular secretion?

    <p>Uric acid</p> Signup and view all the answers

    What is the normal glomerular filtration rate (GFR) in mL/min?

    <p>~120</p> Signup and view all the answers

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