Chapter 32
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Chapter 32

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Questions and Answers

Majority of plasma proteins are produced by the

Liver

A dehydrated animal usually has a relatively _____ total protein concentration

Elevated (hyperproteinemia)

An overly hydrated animal usually has a relatively ______ total protein concentration

Decreased (hypoproteinemia)

One of the most important proteins in plasma, makes up 35% to 50% of total plasma protein in most animals and any significant state of hypoproteinemia is most likely caused by loss of this protein

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

Any diffuse liver disease may result in decreased _____ synthesis

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

Synthesized in the liver and primarily transport and bind proteins. Two important proteins in this fraction are high-density lipoproteins and very-low-density lipoproteins

<p>Alpha globulins</p> Signup and view all the answers

Include complement C3/C4, transferrin and ferritin which are responsible for heme binding, iron transport and fibrin formation and lysis

<p>Beta globulins</p> Signup and view all the answers

Immunoglobulins synthesized by plasma cells, are responsible for antibody production

<p>Gamma globulins</p> Signup and view all the answers

Malfunctions in the liver or gallbladder may result in

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

An insoluble molecule derived from the breakdown of hemoglobin by macrophages in the spleen

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

It is important that samples be protected from light to ensure accurate results because ____ can also be broken down with exposure to light

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

Match

<p>Indicate problems with uptake (hepatic damage) = Increases in unconjugated bilirubin Indicate bile duct obstruction = Increases in conjugated bilirubin</p> <ul> <li>= - 1 = 1</li> </ul> Signup and view all the answers

Aid in fat absorption by enabling the formation of micelles in the gastrointestinal system and modulate cholesterol levels via bile acid synthesis

<p>Bile acids</p> Signup and view all the answers

Match

<p>90-95% of bile acids = are actively reabsorbed in the ileum 5-10% of bile acids = are excreted in the feces Plasma lipoprotein produced primarily in the liver and also ingested in food = Cholesterol Present as isoenzymes in many tissues, particularly osteoblasts in bone, chondroblasts in cartilage, the intestine, the placenta and cells of the hepatobiliary system in the liver = Alkaline phosphate</p> Signup and view all the answers

The common enzyme tests of liver function that are performed in small animal vet practice are

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

Cholestasis causes an increase in serum cholesterol in some species

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

Sometimes used as a screening test for hypothyroidism

<p>Cholesterol assay</p> Signup and view all the answers

In dogs, cats, and primate the major source of ___ is the hepatocyte, where the enzyme is found free in the cytoplasm. ___ is considered a liver specific enzyme in these species. The administration of corticosteroids or anticonvulsant medications may result in increased serum ___ levels

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

___ is present in hepatocytes which are found free in the cytoplasm as well as bound to the mitochondrial membrane, More severe liver damage is required to release the membrane-bound ___.

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

____ is a mitochondrial-bound enzyme found in high concentrations in the hepatocytes of cattle, sheep and goats. Increase in this enzyme is indicative of hepatocyte damage or necrosis in cattle and sheep

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

The blood GGT level is elevated in pts with liver disease, especially in those with obstructive liver disease

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

Dogs horses sheep and goat the albumin concentration is usually _____ than globulins

<p>Greater 1.00</p> Signup and view all the answers

Pigs, cattle and cats albumin concentration is usually ________ than globulins

<p>Equal or less than 1.00</p> Signup and view all the answers

Acute inflammation or tissue damage may elevate plasma fibrinogen

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

Clinical signs of malfunction in the liver include

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

Why is bilirubin and bile acids test more sensitive than other substances produced by hepatocytes

<p>Because test results may not show abnormalities may not show until 2/3rds to 3/4th of liver tissue is damaged</p> Signup and view all the answers

if there is increase of conjugated bilirubin what is it indicative of

<p>Bile duct obstruction</p> Signup and view all the answers

Serum concentration of bile acids do not correlate with portal concentration

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

Enzymes released from damaged hepatocytes include

<p>All of the above</p> Signup and view all the answers

Study Notes

Plasma Proteins

  • Majority of plasma proteins are produced by the liver

Total Protein Concentration

  • A dehydrated animal has a relatively high total protein concentration
  • An overly hydrated animal has a relatively low total protein concentration

Albumin

  • Makes up 35% to 50% of total plasma protein in most animals
  • Any significant state of hypoproteinemia is most likely caused by loss of albumin
  • Synthesized in the liver

Globulins

  • Include complement C3/C4, transferrin, and ferritin
  • Responsible for heme binding, iron transport, and fibrin formation and lysis
  • Immunoglobulins synthesized by plasma cells, responsible for antibody production

Lipoproteins

  • Synthesized in the liver and primarily transport and bind proteins
  • Two important proteins in this fraction are high-density lipoproteins and very-low-density lipoproteins

Liver Function Tests

  • Malfunctions in the liver or gallbladder may result in increased bilirubin levels
  • Bilirubin and bile acids tests are more sensitive than other substances produced by hepatocytes
  • Enzymes released from damaged hepatocytes include ALP, AST, ALT, and GGT

Bilirubin and Bile Acids

  • Bilirubin is an insoluble molecule derived from the breakdown of hemoglobin by macrophages in the spleen
  • Bilirubin can also be broken down with exposure to light
  • Increase in conjugated bilirubin is indicative of liver disease or cholestasis
  • Serum concentration of bile acids does not correlate with portal concentration

Enzymes

  • ALP (Alkaline Phosphatase) is a liver-specific enzyme in dogs, cats, and primates
  • AST (Aspartate Aminotransferase) is present in hepatocytes, found free in the cytoplasm and bound to the mitochondrial membrane
  • ALT (Alanine Aminotransferase) is a mitochondrial-bound enzyme found in high concentrations in the hepatocytes of cattle, sheep, and goats
  • GGT (Gamma-Glutamyl Transferase) level is elevated in patients with liver disease, especially in those with obstructive liver disease

Liver Damage and Disease

  • Cholestasis causes an increase in serum cholesterol in some species
  • Clinical signs of liver malfunction include jaundice, vomiting, and anorexia
  • Acute inflammation or tissue damage may elevate plasma fibrinogen

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