notes: large intestine thursday 1-7-10. (1) overall function reabsorb water pass out remaining waste...
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Notes: Large Intestine
Thursday 1-7-10
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(1) Overall Function
Reabsorb waterPass out remaining waste to
rectum + anus
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(2) Regions
Cecum = 1st ChamberAscending Colon = UpwardsTransverse Colon = AcrossDescending Colon = DownwardsRectum & Anus
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(3) Appendix
Sits beneath cecum Often collects waste and bacteria Appendicitis Functions:
– Produces white blood cells and antibodies for immunity.
– Used to serve a role in cellulose digestion.– Not needed Weeded out through
Evolution?!?
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(4) Passing Through
Waste slowly moves through Large Intestine.– Total Length = 1.5-2m long
Water reabsorbed through microvilli.– Result = Solidified waste mass
(Feces)
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(5) Colon Bacteria
Over 700 species of bacteriaOrigins:
– Food Eaten– Anus
Helpful:– Metabolize left over proteins– Metabolize indigestible carbohydrates– Produce vitamins from inorganics
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(6) Rectum & Anus
Rectum = Inside part Anus = Outside part = Butthole Mechanism:
– Remaining waste drops first into rectum– Lands on top of Involuntary Sphincter– Opens w/pressure– Lands on top of Voluntary Sphincter– Made of Skeletal Muscle that you control
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