Title: Anat & Phys 3/15/07 Objectives: Class Topics . 11/22/2018 Title: Anat & Phys 3/15/07 Objectives: . Class Topics 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 Thursday, November 22, 2018 3:21 PM

Class Assignments Due this class period Due next class period 11/22/2018 Class Assignments What By When Due this class period Due next class period Due in the future

11/22/2018 Lab Complete the lab

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Large Intestine 1.5 m long, 7.5 cm wide 3 regions cecum, colon, rectum 11/22/2018 Large Intestine 1.5 m long, 7.5 cm wide 3 regions cecum, colon, rectum

functions 1. Reabsorption of water and compaction of chyme into feces 11/22/2018 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 Colon very short, takes chyme from ileum 11/22/2018 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

Areas Rectum Leads to anus expandable for storage 11/22/2018 Areas Rectum expandable for storage internal anal sphincter - smooth external anal sphincter - skeletal Leads to anus

Bacteria & feces Liberate vitamins K & B12 11/22/2018 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