Slide 1

Human DigestionScience 7by: Mr. Rockensies Aim: How does the digestive system break down food into nutrients?

Do Now: How many feet does your food travel through the digestive system?

HW: WorksheetThe Stormy Sea

Then, the valve to the stomach opens and pizza mush lands in your stomach!

The small intestine looks like a strange underwater world filled with things that resemble small finger-like cactuses.A glorious, if slightly stinky, journey, don't you think?

Name the term used to describe the muscular contraction that pushes your food down the esophagus and into the stomach.Describe the role that mucus plays in the stomach.Determine the 5 steps that food takes as it travels through the digestive system.In-class ExercisesperistalsisActs as a liner, protecting the stomach from acid burnsEat the foodFood enters stomach and is further digested by acidNutrients are absorbed by the small intestineWaste not absorbed has water taken out by large intestineWaste is removed from the bodyEat/IngestIn-class ExercisesWhat is digestion?EDDiEEDDiEDiffusionDigestionEliminate/ EgestThe breakdown of food so that it can be absorbedYou chew food with your teeth, breaking it down into smaller pieces. Saliva breaks down starch molecules into simple sugars.The esophagus pushes the food down to the stomach using peristalsis. The stomach fills with acid and contracts to mix the food and acid.After the stomach, the food enters the small intestine and is mixed with juices filled with enzymes that further break down food to be absorbed by villiFood then travels to the colon, or large intestine, where it is dehydrated. The water is removed and the remaining waste is then pushed out of the body by the rectum through the anusIn-class ExercisesHow is food broken down?a) physical changesb)chemical changesFood is broken down mechanically chewing, mixing, grindingEx: Teeth chewing, stomach churningFood is mixed with acids and digestive juices containing enzymes to further break down food and release nutrients for absorption1) E - eat/ingest2) D - digest3) Di - diffusion4) E - eliminate/egestHypothesize what might happen if H2O was not removed during the final stages of digestion in the large intestine.Mouth, teeth, salivary glands, tongue, esophagus

In-class ExercisesStomach, pancreas, liver, gall bladder, small intestineSmall intestine (villi), large intestineLarge intestine, rectum, anus