Large Intestine: Anatomy, Histology, Physiology
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Questions and Answers

Which part of the large intestine does not have folds or villi?

  • Terminal ileum
  • Sigmoid colon
  • Descending colon
  • Rectum (correct)
  • Which artery supplies the proximal ascending colon?

  • Middle colic artery
  • Right colic artery (correct)
  • Ileocolic artery
  • Left colic artery
  • Which part of the large intestine is innervated by sympathetic nerves from T6-T12 and L1-L3?

  • Transverse colon (correct)
  • Sigmoid branches
  • Descending colon
  • Left colic artery
  • Which part of the large intestine has many deep crypts and intestinal glands in its mucosa?

    <p>Descending colon</p> Signup and view all the answers

    Which part of the large intestine has appendices epiploicae within the serosa?

    <p>Sigmoid colon</p> Signup and view all the answers

    Which part of the large intestine lacks absorbent villi but has simple columnar epithelium with many goblet cells?

    <p>Ascending colon</p> Signup and view all the answers

    Which of the following is a major anatomical component of the large intestine?

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

    What is the function of mucin in the large intestine?

    <p>Add mucus to convert undigested material into feces</p> Signup and view all the answers

    What is the role of the sympathetic and parasympathetic nerves in the large intestine?

    <p>Parasympathetic nerves control submucosal blood flow</p> Signup and view all the answers

    What is the main function of the large intestine in producing SCFA, Vitamin K, and Biotin?

    <p>Convert Undigested Material into Feces</p> Signup and view all the answers

    Which reflex aids in moving material from the stomach into the large intestine?

    <p>Gastrocolic reflex</p> Signup and view all the answers

    What is the main clinical feature of Irritable Bowel Syndrome (IBS)?

    <p>Persistent Diarrhea</p> Signup and view all the answers

    What is the primary driver for water absorption in the large intestine?

    <p>Sodium absorption</p> Signup and view all the answers

    Which type of movement in the large intestine involves simultaneous contraction of smooth muscle over large areas?

    <p>Mass action contraction</p> Signup and view all the answers

    In which congenital disorder are ganglions absent in myenteric and submucosal plexuses in the distal colon?

    <p>Hirschsprung Disease</p> Signup and view all the answers

    Which reflex allows for the passage of chyme from the small intestine to the large intestine?

    <p>Gastroileal reflex</p> Signup and view all the answers

    What is the function of mucin proteins secreted by the large intestine?

    <p>Create a mucus layer on epithelial cells</p> Signup and view all the answers

    How does the Gastrocolic reflex in the large intestine respond to the presence of food in the stomach?

    <p>Stimulates large waves of peristalsis</p> Signup and view all the answers

    What part of the large intestine is most prone to perforation?

    <p>Descending colon</p> Signup and view all the answers

    Which ligaments provide support to the lower portion of the rectum?

    <p>Lateral ligament</p> Signup and view all the answers

    What anatomical structure separates the rectum from the prostate and seminal vesicles or vagina?

    <p>Denonvilliers' fascia</p> Signup and view all the answers

    If the fascia anterior to the rectum is defective, what condition can develop?

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

    Which nerves innervate the rectum?

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

    What kind of muscle makes up the external anal sphincter?

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

    What initiates a reflex contraction of the rectal muscles during defecation?

    <p>Distention of the rectum</p> Signup and view all the answers

    Which mechanism is responsible for the electroneutral absorption of NaCl in the intestines?

    <p>Exchange of Na+ for H+</p> Signup and view all the answers

    What causes the relaxation of the internal anal sphincter during defecation?

    <p>Inhibitory signals from the sacral parasympathetic nervous system</p> Signup and view all the answers

    What is the role of the external anal sphincter during defecation?

    <p>To relax voluntarily</p> Signup and view all the answers

    Which nerve is responsible for the innervation of the external anal sphincter during defecation?

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

    How is fecal continence maintained in the body?

    <p>Both sphincters are tonically active</p> Signup and view all the answers

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