Small Intestinal Brush-Border Enzymes Quiz
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Questions and Answers

Where does lipid digestion predominantly occur?

  • Small intestine (correct)
  • Stomach
  • Mouth
  • Esophagus
  • What process enhances the rate of lipid digestion by dividing large droplets into small fat droplets?

  • Coagulation
  • Emulsification (correct)
  • Condensation
  • Agglomeration
  • What enables access to water-soluble lipase by attaching pancreatic lipase to fat droplets?

  • Gastric lipase
  • Lingual lipase
  • Colipase (correct)
  • Bile salt
  • What is the role of emulsifying agents in lipid digestion?

    <p>Enhancing lipid emulsification</p> Signup and view all the answers

    What characteristic allows emulsifying agents to associate with both fat and water?

    <p>&quot;Amphipathic&quot;</p> Signup and view all the answers

    Which enzyme cleaves off two fatty acid chains during lipid digestion?

    <p>&quot;Pancreatic lipase&quot;</p> Signup and view all the answers

    How is lactose broken down in the small intestine?

    <p>Into glucose and galactose</p> Signup and view all the answers

    Which enzyme is responsible for breaking down sucrose in the small intestine?

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

    How are monosaccharides absorbed in the small intestine?

    <p>Through both active transport and facilitated diffusion</p> Signup and view all the answers

    Which transporter is responsible for taking up fructose in the small intestine?

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

    What is the role of endopeptidases in protein digestion?

    <p>Break peptide bonds within the amino acid chain</p> Signup and view all the answers

    Which enzyme is responsible for cleaving peptide bonds to release single amino acids?

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

    From which sources can heme iron be obtained for absorption in the body?

    <p>Meat, poultry, and fish</p> Signup and view all the answers

    Where does the absorption of Ca2+ mainly occur in the small intestine?

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

    How are fat-soluble vitamins absorbed in the small intestines?

    <p>By endocytosis</p> Signup and view all the answers

    What is the role of intrinsic factor in the absorption of vitamin B12?

    <p>Facilitates absorption in the ileum</p> Signup and view all the answers

    Which form of iron is mainly obtained from cereals, legumes, fruits, and vegetables for absorption?

    <p>Nonheme (ionic) iron</p> Signup and view all the answers

    How are water-soluble vitamins like vitamin C and B complex mainly absorbed in the body?

    <p>By diffusion or mediated transport</p> Signup and view all the answers

    What is the major function of bile in the digestive system?

    <p>Neutralize acidic chyme from the stomach</p> Signup and view all the answers

    Which component of bile serves as a route of excretion for bilirubin?

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

    How do bile salts contribute to digestion and absorption in the body?

    <p>Emulsify fat and help in fat absorption</p> Signup and view all the answers

    What is the main role of the smooth muscles in the gastrointestinal tract?

    <p>Move food and mechanically mix it for digestion</p> Signup and view all the answers

    Which layer of smooth muscle is predominantly seen in the gastrointestinal tract?

    <p>Double layer of circular muscles</p> Signup and view all the answers

    What is the primary function of bile pigments in the digestive system?

    <p>Route of excretion for bilirubin</p> Signup and view all the answers

    Which muscle is responsible for creating a more acute angle between the rectum and the anal canal?

    <p>Puborectalis muscle</p> Signup and view all the answers

    Which type of muscle is the internal anal sphincter?

    <p>Smooth muscle</p> Signup and view all the answers

    What happens to the puborectalis muscle during defecation?

    <p>It relaxes</p> Signup and view all the answers

    Which nerve innervates the external anal sphincter?

    <p>Pudendal nerves</p> Signup and view all the answers

    What triggers a reflexive contraction in the sigmoid colon and rectum?

    <p>Increased pressure in the rectum</p> Signup and view all the answers

    What does the defecation reflex trigger?

    <p>Urge to defecate</p> Signup and view all the answers

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