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DIGESTIVE SYSTEM

Chapter 15 Lesson 6. DIGESTIVE SYSTEM . Definitions . Digestive System: An organ system that converts food to a form useful to the body Digestion: the changing of food you eat into substances the body can use . 1. MOUTH. Food goes in the mouth Teeth cut and grind food into smaller pieces

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DIGESTIVE SYSTEM

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  1. Chapter 15 Lesson 6 DIGESTIVE SYSTEM

  2. Definitions • Digestive System: An organ system that converts food to a form useful to the body • Digestion: the changing of food you eat into substances the body can use

  3. 1. MOUTH • Food goes in the mouth • Teeth cut and grind food into smaller pieces • The tongue moves food to the back of the throat so you can swallow it • Saliva moistens and softens food (99% of saliva is water)

  4. 2. ESOPHAGUS • Muscular tube that pushes food down into the stomach • Located behind the trachea

  5. 3. STOMACH Located above the waist in between the lower ribs, just below the breastbone Muscular sac that collects food and churns it Glands secrete juices that break down protein duodenum Layers of muscle

  6. 4. SMALL INTESTINE -20 feet long -Coiled tube like organ -Absorbs the digestive nutrients -Nutrients are used for growth, energy, and repair -Most digestion takes place in the duodenum (1st section of small intestine)

  7. 5. LIVER,GALLBLADDER,PANCREAS • Liver= produces bile substance that aids in the digestion of fat • Gallbladder= small saclike organ that stores bile. Releases bile as small intestine needs it. • Pancreas= organ that produces enzymes released directly in the small intestine (Starches, protein, fat)

  8. 6. LARGE INTESTINE • Part of the excretory system • Colon- large intestine • Remains of food that your body can’t digest pass into the colon • Lining of the colon absorbs most of the liquid from undigested material. • Solid left is called feces

  9. 7. ANUS • When large intestine is full nerve signals muscles in the walls of the colon to contract • This action pushes feces through the anus and out of the body • Takes 18-30 hours for food you eat to pass through the digestive system

  10. Draw the digestive system • Mouth: red • Esophagus: Blue • Stomach: green • Small Intestine: yellow • Colon: Orange • Rectum and anus: purple

  11. RAFT Write as if you were a piece of food traveling through the digestive system. What happens? • Role= any piece of food • Audience= your classmates • Form= journal entry • Topic= passing through the digestive system

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