Liver Function and Disease

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Questions and Answers

In patients with end-stage liver disease, what happens to the concentration of urea and ammonia in plasma?

  • Both urea and ammonia concentrations increase.
  • Urea concentration decreases, and ammonia concentration increases. (correct)
  • Urea concentration increases, and ammonia concentration decreases.
  • Both urea and ammonia concentrations decrease.

A patient presents with jaundice and elevated levels of both direct and indirect bilirubin. Which of the following conditions is the MOST likely cause?

  • Gilbert's syndrome
  • Post-hepatic jaundice due to gallstones
  • Hepatic jaundice due to viral hepatitis (correct)
  • Pre-hepatic jaundice due to hemolytic anemia

Which of the following is NOT a primary function of the liver?

  • Synthesis of plasma proteins
  • Detoxification of ammonia to urea
  • Secretion of insulin (correct)
  • Production of bile salts

A patient's lab results show a significant increase in Alkaline Phosphatase (ALP) and Gamma-glutamyl transferase (GGT) levels, with only a slight increase in Alanine Aminotransferase (ALT). Which condition is MOST likely?

<p>Biliary obstruction (A)</p> Signup and view all the answers

In which type of jaundice would you expect to find a normal level of urobilinogen in the urine?

<p>Hepatocellular jaundice (B)</p> Signup and view all the answers

What is the role of the reticuloendothelial system in bilirubin metabolism?

<p>Catabolizes heme into bilirubin (A)</p> Signup and view all the answers

Which of the following enzymes involved in liver function is MOST specific for hepatocellular damage?

<p>Alanine aminotransferase (ALT) (A)</p> Signup and view all the answers

A patient with a genetic defect has a deficiency in the enzyme needed to conjugate bilirubin. Which form of bilirubin would be elevated in their blood?

<p>Indirect bilirubin (C)</p> Signup and view all the answers

Which of the following vitamins are stored in the liver?

<p>Vitamin A, D, K and B12 (B)</p> Signup and view all the answers

In the context of liver function, what is the significance of alpha-fetoprotein (AFP)?

<p>It is a marker that increases significantly in hepatocellular carcinoma. (B)</p> Signup and view all the answers

Flashcards

What is Bilirubin?

Orange-yellow pigment from RBC turnover; extracted and biotransformed in the liver, then excreted in bile and urine.

What is pre-hepatic jaundice?

Results from excessive bilirubin presented to the liver, characterized by unconjugated hyperbilirubinemia

What is Hepatic Jaundice?

Occurs due to intrinsic liver defect/disease affecting bilirubin metabolism or transport.

What is Post-hepatic jaundice?

Results from impaired bilirubin excretion due to mechanical obstruction of bile flow.

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When is indirect bilirubin increased?

Increased in hemolysis, Gilbert's syndrome, and severe liver injury.

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When is direct bilirubin increased?

Increased in extrahepatic cholestasis, tumors of bile duct, carcinoma of pancreas, lymph node enlargement.

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What are the 4 types of bile acids?

  1. cholic acid 2. chenodeoxycholic acid 3. deoxycholic acid 4. lithocholic acid
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What causes disturbances in bile acid metabolism?

Hepatitis or cirrhosis, bile duct obstruction, and bile acid malabsorption.

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How does ALT work?

Catalyzes the transfer of an amino group from alanine to oxoglutarate, producing pyruvate and glutamate.

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What is Alkaline Phosphatase (ALP)?

Collective name for enzymes hydrolyzing phosphate esters; elevated in liver, bone, and other diseases.

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