Sponge 1 Word Bank Anus Esophagus Gallbladder Large Intestine Liver Mouth Pancreas Salivary Glands Rectum Small Intestines Stomach 11 2 10 3 9 4 5 8 6 7
Salivary glands mouth esophagus liver stomach gallbladder pancreas Small intestines Large intestines rectum anus
32.2 Digestive System 2.1 Atoms, Ions, and Molecules Set up Cornell Notes on pg. 79 • Topic: 32.2 Digestive System • Essential Question(s): • No EQ
KEY CONCEPTThe digestive system breaks down food into simpler molecules.
In 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 stomach • Beaumont 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
mouth esophagus liver gallbladder large intestine small intestine rectum/anus The digestive system is a collection of organs that breaks down food into energy that can be used in cells
mouth esophagus liver gallbladder large intestine small intestine rectum/anus • After digestion is complete, nutrients are absorbed and transported to all cells. • Undigested materials are eliminated as liquid and solid wastes (urine/feces)
Digestion of carbohydrates begins in the mouth. • Digestion of proteins occurs in the stomach. • Digestion of fats and sugars occur in thesmall intestine.
Mouth • Teeth: Mechanical digestion, shred and grind food • Saliva: chemical digestion • Enzyme: amylase (Am-uh-Lays) • Breaks down starch into sugars • Tongue: Keeps food positioned between teeth • Digestion starts in the mouth!!!! stomach
esophagus muscles relax food Esophagus • Tube that connects mouth to the stomach • Peristalsis(pear-ih-stawl-sis) moves food through the organs muscles contract stomach
Stomach • Muscular sac • Holds up to 2 quarts of food • Continues digestion • Proteins are digested in the stomach • Chyme: semi-liquid mixture of food • 2-6 hours to digest food
gallbladder pancreas duodenum Pancreas, Liver, and Gall bladder • Aid in digestion • Pancreas: helps digest fat, protein, and starches • Liver: Produces bile which helps digest fats • Gallbladder: stores bile liver stomach bile chyme bile enzymes
Small Intestines • Most digestion takes place in the small intestines • Digests: • Proteins • Fats • Sugars
Large Intestine, Rectum, Anus • Large Intestine: helps to maintain the body’s fluid balance • Absorbs water and salt • Undigested material forms the solid feces. • stored in rectum • eliminated through anus
Sponge 1. 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?
What 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 food • Chemical: enzymes in saliva break down starches • What three organs aide the small intestine with digestion? • Gallbladder, liver, and pancreas • If you ate a meal of spaghetti and meatballs, where would digestion of the pasta begin? The meat? • Spaghetti: in mouth- starches • Meatballs: in stomach- proteins
Circulatory and Digestive System Posters • Title on top • Describe the FUNCTION (job) of your organ • Draw a picture • Answer all questions on prompt • Color • Use Big font