Dissection lower digestive tract

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Class Topics
Title Anat Phys 3/15/07
Objectives

• .

• Dissection lower digestive tract
• Notes large intestine
• Test Review
• The young do not know enough too be prudent, and
  therefore they attempt the impossible, and
  achieve it, generation after generation.
• Pearl S. Buck

Wednesday, November 18, 2009 510 AM
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Class Assignments
By When
What

• Due this class period
• Due next class period
• Due in the future

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Lab

• Complete the lab

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Large Intestine

• 1.5 m long, 7.5 cm wide
• 3 regions
• cecum, colon, rectum

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functions

• 1. Reabsorption of water and compaction of chyme
  into feces
• 1500 ml chyme enters 200 ml feces leaves
• 2. Absorption of vitamins and minerals liberated
  by bacteria
• 3. storage of fecal matter

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Areas

• Cecum
• very short, takes chyme from ileum
• has appendix attached
• Colon
• has pouches to allow for distension elongation
• 4 regions - ascending, transverse, descending,
  and sigmoid

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Areas

• Rectum
• expandable for storage
• internal anal sphincter - smooth
• external anal sphincter - skeletal
• Leads to anus

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Bacteria feces

• Liberate vitamins K B12
• byproduct - hydrogen sulfide
• rotten eggs
• source of flatus
• break down indigestible carbohydrates
• Feces - 75 water, 5 bacteria, 20 indigestible
  material