Digestive Digestive SystemSystem(Part I)(Part I)

Digestive SystemDigestive System

Sometimes called Alimentary Canal – 30 ft Sometimes called Alimentary Canal – 30 ft long!long!

Two divisions:Two divisions:– Canal – where digestion occursCanal – where digestion occurs– Accessory organs – no digestion occursAccessory organs – no digestion occurs

TeethTeeth TongueTongue Salivary glandsSalivary glands LiverLiver Gall bladderGall bladder pancreaspancreas

Types of DigestionTypes of Digestion MechanicalMechanical

– Teeth Teeth – tonguetongue

Chemical – salivary Chemical – salivary enzymes break down enzymes break down proteins, fats and proteins, fats and carbohydratescarbohydrates

TeethTeeth

http://whyfiles.org/shorties/147tooth/images/teeth.jpg

Tongue Tongue

http://www.oralcancerfoundation.org/dhttp://www.oralcancerfoundation.org/dental/images/tongue_exam.jpgental/images/tongue_exam.jpg

picture of underside of tongue picture of underside of tonguehttp://www.neurobio.arizona.edu/282/Lhttp://www.neurobio.arizona.edu/282/Lectures2005/Taste/08_003.jpgectures2005/Taste/08_003.jpg

shows Tongue and taste buds shows Tongue and taste budshttp://www.morphonix.com/software/educatihttp://www.morphonix.com/software/education/science/brain/game/specimens/taste_budon/science/brain/game/specimens/taste_buds.htmls.html

Animation of taste to receptor nerve Animation of taste to receptor nervehttp://www.morphonix.com/software/educatihttp://www.morphonix.com/software/education/science/brain/game/specimens/taste_bud.on/science/brain/game/specimens/taste_bud.htmlhtml

Taste bud animated Taste bud animated

SwallowingSwallowing

http://www.innerbody.com/anim/mouth.hthttp://www.innerbody.com/anim/mouth.htmlml process of swallowing process of swallowing

http://www.innerbody.com/image/dige01.hhttp://www.innerbody.com/image/dige01.htmltml shows upper palate - hard and soft shows upper palate - hard and soft

http://www.medicalook.com/systems_imaghttp://www.medicalook.com/systems_images/Esophagus.jpges/Esophagus.jpg shows esophagus, pierces the diagragm, shows esophagus, pierces the diagragm, is located posterior to the trachea’s C-is located posterior to the trachea’s C-shaped cartilage rings.shaped cartilage rings.

http://www.admit-online.info/images/admithttp://www.admit-online.info/images/admit/cd_rom/1131_trachea09.gif/cd_rom/1131_trachea09.gif shows tracheal ring shows tracheal ring

Endoscopic ViewEndoscopic View

http://www.youtube.com/watch?v=fff7xunhttp://www.youtube.com/watch?v=fff7xunqgtI&feature=relatedqgtI&feature=related digestion and uptake of nutrients, liver digestion and uptake of nutrients, liver and portal circulation (3.50 min)and portal circulation (3.50 min)

http://www.youtube.com/watch?v=tWJoYk_http://www.youtube.com/watch?v=tWJoYk_NJt0NJt0 endoscopic views (3.50 min) endoscopic views (3.50 min)

http://www.youtube.com/watch?v=sCn5uvhttp://www.youtube.com/watch?v=sCn5uvvc3WE&feature=relatedvc3WE&feature=related mentions salivary enzymes, and mentions salivary enzymes, and lymphatic system (2.25 min)lymphatic system (2.25 min)

Types of FoodsTypes of Foods

ProteinsProteins FatsFats CarbohydratesCarbohydrates

http://www.youtube.com/watch?v=IxNhttp://www.youtube.com/watch?v=IxNpXO8gGFM&feature=relatedpXO8gGFM&feature=related

Digestion of proteins, fats and carbs Digestion of proteins, fats and carbs (2.5 min)(2.5 min)

NutritionNutrition

Let’s look at sugar in certain foodsLet’s look at sugar in certain foods Let’s look at fat contentLet’s look at fat content Reading labelsReading labels http://http://

kidshealth.org/kid/closet/games/missikidshealth.org/kid/closet/games/mission_nutrition.htmlon_nutrition.html

Layers of the Alimentary Layers of the Alimentary TubeTube

Mucosal layerMucosal layer Submucosal layerSubmucosal layer External muscle layerExternal muscle layer SerosaSerosa

Small IntestineSmall Intestine

http://www.nlm.nih.gov/medlineplus/http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19221.jpgency/images/ency/fullsize/19221.jpg shows omentum, cecal pouch, shows omentum, cecal pouch, appendixappendix

http://bio.bd.psu.edu/cat/Circulatory_http://bio.bd.psu.edu/cat/Circulatory_System/vesels%20of%20small%20intSystem/vesels%20of%20small%20intestine.jpgestine.jpg shows omentum and vascularity shows omentum and vascularity

http://www.becomehealthynow.com/ihttp://www.becomehealthynow.com/images/organs/digestive/intest_sectiomages/organs/digestive/intest_section.gifn.gif Villi Villi

LiverLiver

http://images.medicinenet.com/images/Livhttp://images.medicinenet.com/images/Liver.jpger.jpg shows location of liver in relation to ribs shows location of liver in relation to ribs

http://wwwisg.cs.uni-magdeburg.de/cv/gallhttp://wwwisg.cs.uni-magdeburg.de/cv/gallery/VesselVis/portalVein_liver.jpgery/VesselVis/portalVein_liver.jpg shows portal veins shows portal veins

http://www.freewebs.com/soaring_sphinctehttp://www.freewebs.com/soaring_sphincter_travel_agency/Liver.jpgr_travel_agency/Liver.jpg shows liver and gall bladder and ducts shows liver and gall bladder and ducts

http://www.stanford.edu/group/virus/http://www.stanford.edu/group/virus/hepadna/2004tansilvis/liverhepadna/2004tansilvis/liver%20cirrhosis.gif liver cirrhosis%20cirrhosis.gif liver cirrhosis

Gall bladderGall bladder

http://www.youtube.com/watch?http://www.youtube.com/watch?v=Pr3Md9XlLvw&feature=related v=Pr3Md9XlLvw&feature=related cholecystectomycholecystectomy

http://www.pims.math.ca/science/http://www.pims.math.ca/science/2003/inverse/gall_bladder.jpeg US of 2003/inverse/gall_bladder.jpeg US of GBGB

PancreasPancreas

Exocrine and endocrine gland. Exocrine and endocrine gland. Exocrine function is to secrete Exocrine function is to secrete

enzymes:enzymes:– AmylaseAmylase– LipaseLipase– TrypsinTrypsin

Neutralizes gastric juicesNeutralizes gastric juices

Other linkOther link

http://www.innerbody.com/image/dighttp://www.innerbody.com/image/digeov.htmleov.html - shows some body systems, - shows some body systems, animations (such as swallowing) etc.animations (such as swallowing) etc.