The Digestive System 3.5 & 3.6.

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Presentation transcript:

The Digestive System 3.5 & 3.6

Image from: http://www. webmd

Stages of Food Processing ingestion digestion absorption egestion

Ingestion teeth: physical breakdown of food salivary glands: amylase in saliva breaks down starch (chemical digestion) tongue: forms bolus, pushes it back to pharynx esophagus: peristalsis moves bolus down http://www.youtube.com/watch?v=h0E9ITyRlh0

Digestion (Stomach) Image from: http://www.webmd.com/digestive-disorders/picture-of-the-stomach

Digestion (Stomach) gastric juices: hydrochloric acid + enzymes (e.g., pepsin) mucus: protects lining of stomach from damage chyme = partly digested food, water, and gastric juice that enters the small intestine

Digestion (Duodenum) Image from: http://en.wikipedia.org/wiki/Duodenum

Image from: http://www. shadygroveadventisthospital

Digestion (Duodenum) bile (produced in liver, stored in gall bladder): emulsifies fat lipase, amylase, trypsin (produced in pancreas): digest fat, starch, protein maltase, peptidases (produced in duodenum): digest maltose, polypeptides

Absorption (Small Intestine) Image from: http://www.webmd.com/digestive-disorders/small-intestine

Small Intestine up to 7 metres in length (25 cm of which is duodenum), 2.5 cm wide villi & microvilli increase surface area for absorption Image from: http://mcsd-ws.mcbarons.manheimcentral.org/~williamst/Frog/Villi.htm

Large Intestine 1.5 metres long, 5 cm in diameter absorbs water helpful bacteria produces vitamins K and B Image from: http://www.umm.edu/imagepages/8834.htm

Egestion Image from: http://www.umm.edu/patiented/articles/large_intestine_000326.htm

Animations Process of digestion: http://www.youtube.com/watch?v=Z7xKYNz9AS0 Animation & Quiz: http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter26/animation__organs_of_digestion.html

Is it Art? Artist Wim Delvoye