3Set up Cornell Notes on pg. 79 Topic: 32.2 Digestive System Essential Question(s):No EQ 32.2 Digestive System2.1 Atoms, Ions, and Molecules
4KEY CONCEPT The digestive system breaks down food into simpler molecules.
5In 1822, Alexis St. Martin was shot in the stomach and treated by William Beaumont, an army surgeon The bullet had left a small hole in his stomachBeaumont persuaded St. Martin to let him observe the digestive process by tying foods to string, putting them into the stomach, and observing how the food was digested
6The digestive system is a collection of organs that breaks down food into energy that can be used in cellsmouthesophaguslivergallbladderlarge intestinesmall intestinerectum/anus
8After digestion is complete, nutrients are absorbed and transported to all cells. Undigested materials are eliminated as liquid and solid wastes (urine/feces)mouthesophaguslivergallbladderlarge intestinesmall intestinerectum/anus
9Digestion of carbohydrates begins in the mouth. Digestion of proteins occurs in the stomach.Digestion of fats and sugars occur in the small intestine.
10Teeth: Mechanical digestion, shred and grind food MouthTeeth: Mechanical digestion, shred and grind foodSaliva: chemical digestionEnzyme: amylase (Am-uh-Lays)Breaks down starch into sugarsTongue: Keeps food positioned between teethDigestion starts in the mouth!!!!stomach
11Tube that connects mouth to the stomach EsophagusTube that connects mouth to the stomachPeristalsis (pear-ih-stawl-sis) moves food through the organsesophagusmuscles contractmuscles relaxfoodstomach
12StomachMuscular sacHolds up to 2 quarts of foodContinues digestionProteins are digested in the stomachChyme: semi-liquid mixture of food2-6 hours to digest food
13Pancreas, Liver, and Gall bladder Aid in digestionPancreas: helps digest fat, protein, and starchesLiver: Produces bile which helps digest fatsGallbladder: stores bileliverstomachbilechymebileenzymesgallbladderpancreasduodenum
14Small IntestinesMost digestion takes place in the small intestinesDigests:ProteinsFatsSugars
15Large Intestine, Rectum, Anus Large Intestine: helps to maintain the body’s fluid balanceAbsorbs water and saltUndigested material forms the solid feces.stored in rectumeliminated through anus
16Sponge1. What is the main function of the digestive system? 2. Describe how the mouth uses both mechanical and chemical digestion. 3. What three organs aide the small intestine with digestion? 4. If you ate a meal of spaghetti and meatballs, where would digestion of the pasta begin? The meat?
17What is the main function of the digestive system? To break down food into smaller molecules for the body to absorb and use for energy.Describe how the mouth uses both mechanical and chemical digestion.Mechanical: teeth chew foodChemical: enzymes in saliva break down starchesWhat three organs aide the small intestine with digestion?Gallbladder, liver, and pancreasIf you ate a meal of spaghetti and meatballs, where would digestion of the pasta begin? The meat?Spaghetti: in mouth- starchesMeatballs: in stomach- proteins
18Circulatory and Digestive System Posters Title on topDescribe the FUNCTION (job) of your organDraw a pictureAnswer all questions on promptColorUse Big font