Large Intestine Mucous Secretion Regulation
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Questions and Answers

What is the primary mechanism by which the rate of mucus secretion in the large intestine is regulated?

  • Hormonal stimulation from the pituitary gland
  • Sympathetic innervation from the spinal cord
  • Direct, tactile stimulation of the epithelial cells (correct)
  • Increased blood flow to the large intestine

    • What is the function of mucus in the large intestine?

  • It absorbs water and electrolytes
  • It protects the intestinal wall and holds fecal matter together (correct)
  • It facilitates the digestion of nutrients
  • It regulates the motility of the colon

    • What type of innervation can cause a marked increase in mucus secretion in the large intestine?

  • Parasympathetic innervation (correct)
  • Enteric innervation
  • Sympathetic innervation
  • Somatic innervation

    • What is the effect of extreme parasympathetic stimulation on the large intestine?

    <p>It causes a marked increase in mucus secretion and motility</p> Signup and view all the answers

    What is the location of the mucous cells in the large intestine?

    <p>In the crypts of Lieberkühn</p> Signup and view all the answers

    What is the effect of increased mucus secretion on the large intestine?

    <p>It increases peristaltic motility</p> Signup and view all the answers

    What stimulates the secretion of Brunner's glands?

    <p>Gastrointestinal hormones, especially secretin</p> Signup and view all the answers

    What is the primary function of the mucus secreted by Brunner's glands?

    <p>To protect the duodenal wall from digestion by acidic gastric juice</p> Signup and view all the answers

    What type of stimulation inhibits the secretion of Brunner's glands?

    <p>Sympathetic stimulation</p> Signup and view all the answers

    What is the function of the bicarbonate ions in the mucus secreted by Brunner's glands?

    <p>To neutralize the hydrochloric acid entering the duodenum from the stomach</p> Signup and view all the answers

    Where are the crypts of Lieberkühn located?

    <p>Between the intestinal villi</p> Signup and view all the answers

    What is the relationship between the parasympathetic nervous system and the secretion of Brunner's glands?

    <p>The parasympathetic nervous system stimulates the secretion of Brunner's glands</p> Signup and view all the answers

    What is the primary function of the small intestine?

    <p>To absorb nutrients and their digestive products into the blood</p> Signup and view all the answers

    What is the main role of goblet cells in the intestinal epithelium?

    <p>To produce mucus that lubricates and protects the intestinal surfaces</p> Signup and view all the answers

    What is the pH of the intestinal secretions produced by the enterocytes?

    <p>Slightly alkaline, ranging from 7.5 to 8.0</p> Signup and view all the answers

    What is the mechanism by which water is moved into the intestinal secretions?

    <p>Osmotic movement of water due to the secretion of ions</p> Signup and view all the answers

    What is the daily rate of intestinal secretions produced by the enterocytes?

    <p>1800 ml/day</p> Signup and view all the answers

    What is the role of the villi in the small intestine?

    <p>To absorb nutrients and their digestive products from the intestinal secretions</p> Signup and view all the answers

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