Small Intestine and Digestion

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Questions and Answers

What is the location where the final levels of digestion occur?

  • Pancreas
  • Brush border (correct)
  • Lumen of the stomach
  • Small intestine

What type of cells secrete hormones such as secretin, cholecystokinin, and gastric inhibitory peptide?

  • Goblet cells
  • Endocrine cells (correct)
  • Paneth cells
  • Absorptive cells

What is the function of the brush border enzymes aminopeptidase and dipeptidase?

  • Break down large starch molecules into medium-sized molecules
  • Break down polypeptides into individual amino acids (correct)
  • Emulsify lipids
  • Break down proteins into smaller polypeptides

What is the function of pancreatic juice in lipid digestion?

<p>Break down lipids into fatty acids and glycerol (C)</p>
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What is the function of the enzyme ribonuclease?

<p>Digest RNA (A)</p>
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What is the function of the mucus secreted by goblet cells?

<p>Lubricate and maintain the integrity of the brush border (A)</p>
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What is the location where most of the digestion of proteins occurs?

<p>Pancreas (A)</p>
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What is the function of the enzyme lingual lipase?

<p>Digest lipids in the stomach (D)</p>
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What is the primary function of the microvilli in the small intestine?

<p>To increase the surface area for digestion and absorption (B)</p>
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What is the role of the brush border in the small intestine?

<p>To trap a thin layer of fluid for final digestion (C)</p>
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Which type of cells are responsible for secreting lysozymes in the small intestine?

<p>Paneth cells (A)</p>
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What is the primary function of the enzyme amylase in digestion?

<p>To break down starch molecules into medium-sized molecules (C)</p>
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What is the role of the pancreas in lipid digestion?

<p>To secrete lipases for digestion (B)</p>
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What is the primary function of the enzyme carboxypeptidase in digestion?

<p>To break down polypeptides into individual amino acids (C)</p>
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What is the role of the enzyme deoxyribonuclease in digestion?

<p>To break down DNA into nucleotides (D)</p>
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What is the primary function of the absorptive cells in the small intestine?

<p>To absorb nutrients into the bloodstream (A)</p>
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