Maternal Colostrum and Antibodies Quiz
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Questions and Answers

Where are amino acids transported out of the enterocytes?

  • Mitochondria
  • Basolateral borders (correct)
  • Cytoplasm
  • Apical borders
  • At what rate is absorption of amino acids in the duodenum and jejunum?

  • Rapid (correct)
  • Intermittent
  • Slow
  • Moderate
  • Where is there little absorption of larger peptides?

  • Ileum (correct)
  • Colon
  • Jejunum
  • Duodenum
  • What is the source of approximately 50% of the digested protein?

    <p>Ingested food</p> Signup and view all the answers

    Where does almost all of the protein in the stools come from?

    <p>Bacteria and cellular debris</p> Signup and view all the answers

    What happens to undigested proteins in infants?

    <p>They are absorbed in moderate amounts</p> Signup and view all the answers

    Where does almost all iron absorption occur in humans?

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

    Which protein facilitates basolateral transport of iron out of enterocytes?

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

    What is the plasma iron level in men under normal conditions?

    <p>130 μg/dL</p> Signup and view all the answers

    Which protein converts Fe2+ to Fe3+ in the plasma?

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

    What is the main function of apoferritin in the body?

    <p>Iron storage</p> Signup and view all the answers

    Where does heme bind to initiate transport into enterocytes?

    <p>Apical transport protein</p> Signup and view all the answers

    What is the main function of cholesterol esterase?

    <p>Hydrolysis of cholesterol esters</p> Signup and view all the answers

    How do fats in the small intestine become emulsified?

    <p>By the action of bile acids, phosphatidylcholine, and monoglycerides</p> Signup and view all the answers

    What happens to lipids when bile acid concentration is high in the intestine?

    <p>Interact with bile acids to form micelles</p> Signup and view all the answers

    Which components are generally found in the hydrophobic centers of micelles?

    <p>Fatty acids, monoglycerides, and cholesterol</p> Signup and view all the answers

    How do lipids move to the brush border of mucosal cells for absorption?

    <p>Diffuse out of micelles through the unstirred layer</p> Signup and view all the answers

    What is the role of micellar formation in lipid digestion and absorption?

    <p>Solubilize lipids and provide a transport mechanism to enterocytes</p> Signup and view all the answers

    What type of immunoglobulins are largely present in maternal colostrum?

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

    How do protein antibodies in maternal colostrum enter the circulation of infants?

    <p>By transcytosis from the mammary epithelium</p> Signup and view all the answers

    What process is responsible for the absorption of intact proteins from the intestine?

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

    What may provoke the formation of antibodies when foreign proteins enter the circulation?

    <p>Formation of antibodies</p> Signup and view all the answers

    What is a common factor in susceptibility to individual food allergies?

    <p>Genetic component</p> Signup and view all the answers

    Which of the following foods are mentioned as common offenders causing allergic responses?

    <p>Crustaceans, mollusks, and fish</p> Signup and view all the answers

    How is glucose transported into the interstitium for absorption?

    <p>Through GLUT2</p> Signup and view all the answers

    What provides the energy for glucose transport into the enterocytes?

    <p>Active transport of Na+</p> Signup and view all the answers

    What happens when the Na+/glucose cotransporter is congenitally defective?

    <p>Severe diarrhea</p> Signup and view all the answers

    Which transporter is responsible for transporting fructose into enterocytes?

    <p>GLUT5</p> Signup and view all the answers

    What is the role of insulin in the intestinal transport of sugars?

    <p>Has little effect</p> Signup and view all the answers

    Why is it important to promptly remove glucose and galactose from the diet in cases of a defective Na+/glucose cotransporter?

    <p>To prevent severe diarrhea</p> Signup and view all the answers

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