Digestive system
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Transcript of Digestive system
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How do the COMPONENTS of a
System INTERCONNECT?
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http://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion
Animation of Digestion
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Notes:
Title: Systems Date: August 11,2011
Summary:
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Overview of Digestion:
http://www.youtube.com/watch?v=uIRHfdrixmA&playnext=1&videos=qKCrsqijhhs&feature=rec-LGOUT-exp_fresh%2Bdiv-1r-1-HM
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INGESTION
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FUNCTION/ PURPOSE OF
SYSTEM
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Digestionbreakdown of food into
molecular components small enough to cross the plasma membrane
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Mechanical DigestionSame volume of food
Small total surface areaLarger total surface area
A larger surface area speeds up digestion
saliva
saliva
saliva
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Digestion• Definition• Digestion is the breaking down of food into
smaller and simpler substances
• Mechanical digestion and Chemical digestion do this in different ways
ABSORBED ELIMINATED
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Absorption
passage of molecules into body's interior &passage throughout the body
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LARGE INTESTINES
ELIMINATION OF WASTE
REABSORBS WATER & SALTS
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STRUCTURE OF SYSTEM
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The Digestive System Use the words below to label the parts of the digestive system. Liver large intestine appendix anus oesophagus rectum small intestine stomach mouth
The Digestive System Use the words below to label the parts of the digestive system. Liver large intestine appendix anus oesophagus rectum small intestine stomach mouth
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TheDigestiveSystem
Mouth / Teeth
Esophagus
Liver
Stomach
Small intestine
Large intestine
Rectum
Anus
Appendix
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OBSERVING DIGESTIVE ORGANS
1. External and internal structure of the stomach. a. How would you describe the external appearance of the stomach?
b. What is the action (behavior) of the stomach?
c. How is the stomach designed to perform its function?
2. External and internal structure of the small and large intestines a. Describe the appearance of the small and large intestines.
b. What are the main actions (behavior) of the small and large intestines?
c. How is the small intestine designed to perform its function?
3. Determining the pH of gastric juice and bile a. Describe the role of gastric juice and bile in digestion.
b. How is the pH of gastric juice and bile related to its role in digestion?
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BEHAVIOR
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http://www.youtube.com/watch?v=vFiavuyk31s&feature=related
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Image source:
http://www.flickr.com/photos/liujoanne/2172007698/
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INTERCONNECTIONDigestion
AbsorptionElimination of
Waste
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REGION OF FOOD TUBE
STRUCTURES INVOLVED
BEHAVIOR
MOUTH TeethTongueSalivary Glands
Chewing (physical/mechanical digestion)Moves foodChemical digestion of starch
esophagus muscles peristalsis
STOMACHStomach lining
Mixing of food with gastric juice (HCl) producing chymeProtein digestionChurning of food (mechanical)
SMALL INTESTINE
DuodenumIleumLiver
Gall bladderPancreas
Final digestionAbsorptionProduces bile (digest fats/neutralize stomach acids)Stores bileReleases enzymes to help digestion
LARGE INTESTINE
Colon
Rectumanus
Removal of waste; reabsorb water and saltsStoring wasteexcretion