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Digestive

System. Digestive. Overview of Digestion: . New: http :// www.youtube.com/watch?v=b20VRR9C37Q&feature=fvwrel. http://www.youtube.com/watch?v=uIRHfdrixmA&playnext=1&videos=qKCrsqijhhs&feature=rec-LGOUT-exp_fresh%2Bdiv-1r-1-HM. INGESTION. FUNCTION/ PURPOSE OF SYSTEM. Digestion. Definition

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Digestive

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  1. System Digestive

  2. Overview of Digestion: New: http://www.youtube.com/watch?v=b20VRR9C37Q&feature=fvwrel http://www.youtube.com/watch?v=uIRHfdrixmA&playnext=1&videos=qKCrsqijhhs&feature=rec-LGOUT-exp_fresh%2Bdiv-1r-1-HM

  3. INGESTION

  4. FUNCTION/ PURPOSE OF SYSTEM

  5. Digestion Definition • MECHANICAL (physical) digestion • breaking down of food into smaller pieces • involves: chewing, grinding, churning • CHEMICAL digestion • Breaking down of food into simpler substances (building blocks) • involves: enzymes • ABSORPTION • Broken down food gets from digestive tract into the body (blood)

  6. Digestion • breakdown of food  into molecular components small enough to cross the plasma membrane

  7. Digestion • Definition • Digestion is the breaking down of food into smaller and simpler substances • Mechanical digestion and Chemicaldigestion do this in different ways Use of enzymes (chemical substances) Physical breakdown

  8. MECHANICAL DIGESTION

  9. saliva saliva saliva Mechanical Digestion Same volume of food Small total surface area Larger total surface area A larger surface area speeds up digestion

  10. Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up digestion

  11. How do nutrients get to the rest of the body? Nutrients pass from the cells of the villi into the body. Blood vessels are covered by a single layer of cells so nutrients pass through cells into the blood.

  12. Absorption passage of molecules into body's interior &passage throughout the body

  13. VILLI Image source: http://www.sciencephoto.com/media/310014/enlarge

  14. Increased Surface Area

  15. ELIMINATION OF WASTE LARGE INTESTINES REABSORBS WATER & SALTS

  16. STRUCTUREand behavior of the SYSTEM

  17. TheDigestiveSystem Mouth / Teeth Esophagus Liver Stomach Small intestine Large intestine Rectum Anus Appendix

  18. Epiglottis Animation Image source: http://www.umm.edu/imagepages/19595.htm

  19. Wave-like contractions Peristalsis video clip Image source: http://media.photobucket.com/image/peristalsis/hurricane78_album/peristalsis.gif?o=2

  20. Tongue Papillae Photograph by SPL/Photo Researchers, Inc. Cone-shaped tongue papillae, seen here in a colored scanning electron micrograph, contain nerve endings that receive and transmit touch sensations to the brain. As we begin chewing, the tongue shapes food in a ball-shaped bolus for swallowing. http://science.nationalgeographic.com/science/photos/digestive-system/?source=A-to-Z#/tongue-papillar_1251_600x450.jpg

  21. Inside the Human Mouth Photograph by Lennart Nilsson Inside the mouth, shown magnified here, teeth, tongue, and saliva work together to physically and chemically break down food. Humans produce up to 3 pints (1.4 liters) of saliva daily, and chemical enzymes in the saliva play a major role in disintegrating starchy foods. http://science.nationalgeographic.com/science/photos/digestive-system/?source=A-to-Z#/human-mouth_1002_600x450.jpg

  22. NOTES! Small Intestine

  23. NOTES! The Large Intestine

  24. This colored scanning micrograph shows a cast of blood vessels from the external wall of the small intestine. Measuring about 22 feet (6.7 meters) in length, the small intestine performs most of the major digestion and absorption of nutrients. The walls of the small intestine are lined with millions of projections called villi, which absorb and transmit nutrients into the bloodstream. http://science.nationalgeographic.com/science/photos/digestive-system/?source=A-to-Z#/small-intestine-vessels_1211_600x450.jpg

  25. http://www.youtube.com/watch?v=vFiavuyk31s&feature=related

  26. INTERCONNECTION Digestion Absorption Elimination of Waste

  27. http://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestionhttp://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion Animation of Digestion

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