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Digestive System (Part I)

This article explores the human digestive system, also known as the alimentary canal, which extends about 30 feet. It is divided into the canal, where digestion occurs, and accessory organs like the liver, gallbladder, pancreas, teeth, tongue, and salivary glands, which aid in the process. We will examine mechanical and chemical digestion, the types of food involved, the anatomy of the digestive organs, and their functions, including nutrient absorption and processing. Discover how digestion plays a crucial role in nutrition and overall health.

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Digestive System (Part I)

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  1. Digestive System(Part I)

  2. Digestive System • Sometimes called Alimentary Canal – 30 ft long! • Two divisions: • Canal – where digestion occurs • Accessory organs – no digestion occurs • Teeth • Tongue • Salivary glands • Liver • Gall bladder • pancreas

  3. Types of Digestion • Mechanical • Teeth • tongue • Chemical – salivary enzymes break down proteins, fats and carbohydrates

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

  5. Tongue http://www.oralcancerfoundation.org/dental/images/tongue_exam.jpg picture of underside of tongue http://www.neurobio.arizona.edu/282/Lectures2005/Taste/08_003.jpg shows Tongue and taste buds http://www.morphonix.com/software/education/science/brain/game/specimens/taste_buds.html Animation of taste to receptor nerve http://www.morphonix.com/software/education/science/brain/game/specimens/taste_bud.html Taste bud animated

  6. Swallowing • http://www.innerbody.com/anim/mouth.html process of swallowing • http://www.innerbody.com/image/dige01.html shows upper palate - hard and soft • http://www.medicalook.com/systems_images/Esophagus.jpg shows esophagus, pierces the diagragm, is located posterior to the trachea’s C-shaped cartilage rings. • http://www.admit-online.info/images/admit/cd_rom/1131_trachea09.gif shows tracheal ring

  7. Endoscopic View • http://www.youtube.com/watch?v=fff7xunqgtI&feature=related digestion and uptake of nutrients, liver and portal circulation (3.50 min) • http://www.youtube.com/watch?v=tWJoYk_NJt0 endoscopic views (3.50 min) • http://www.youtube.com/watch?v=sCn5uvvc3WE&feature=related mentions salivary enzymes, and lymphatic system (2.25 min)

  8. Types of Foods • Proteins • Fats • Carbohydrates http://www.youtube.com/watch?v=IxNpXO8gGFM&feature=related Digestion of proteins, fats and carbs (2.5 min)

  9. Nutrition • Let’s look at sugar in certain foods • Let’s look at fat content • Reading labels • http://kidshealth.org/kid/closet/games/mission_nutrition.html

  10. Layers of the Alimentary Tube • Mucosal layer • Submucosal layer • External muscle layer • Serosa

  11. Small Intestine • http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19221.jpg shows omentum, cecal pouch, appendix • http://bio.bd.psu.edu/cat/Circulatory_System/vesels%20of%20small%20intestine.jpg shows omentum and vascularity • http://www.becomehealthynow.com/images/organs/digestive/intest_section.gif Villi

  12. Liver • http://images.medicinenet.com/images/Liver.jpg shows location of liver in relation to ribs • http://wwwisg.cs.uni-magdeburg.de/cv/gallery/VesselVis/portalVein_liver.jpg shows portal veins • http://www.freewebs.com/soaring_sphincter_travel_agency/Liver.jpg shows liver and gall bladder and ducts • http://www.stanford.edu/group/virus/hepadna/2004tansilvis/liver%20cirrhosis.gif liver cirrhosis

  13. Gall bladder • http://www.youtube.com/watch?v=Pr3Md9XlLvw&feature=related cholecystectomy • http://www.pims.math.ca/science/2003/inverse/gall_bladder.jpeg US of GB

  14. Pancreas • Exocrine and endocrine gland. • Exocrine function is to secrete enzymes: • Amylase • Lipase • Trypsin • Neutralizes gastric juices

  15. Other link • http://www.innerbody.com/image/digeov.html - shows some body systems, animations (such as swallowing) etc.

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