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Digestive System

Digestive System. Getting Ready Activity. Materials: (per pair) 1 piece of paper 1 pen Instructions: Going back and forth between you and your partner, try to map the journey that food takes as it goes through the digestive system

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Digestive System

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  1. Digestive System

  2. Getting Ready Activity Materials: (per pair) 1 piece of paper 1 pen Instructions: • Going back and forth between you and your partner, try to map the journey that food takes as it goes through the digestive system • Be as detailed as possible (try to mention at least 8 organs) • You have one minute to complete the activity

  3. Language Connection • The digestive tract is often called the ‘gastrointestinal’ tract, or GI tract for short • Gastro (greek) = stomach • Intestinal = intestines Gastric – of or relating to the stomach Gastronomy – study of the culture of food Gastric bypass – surgery that bypasses the stomach Gastroenteritis – inflammation (infection) of the stomach

  4. Digestive System • The organ system that is made up of the mouth, esophagus, stomach, intestines, liver, pancreas, and gall bladder • The system that takes in (ingestion), breaks up (digestion), absorbs (absorption), and eliminates wastes (egestion)

  5. The GI Tract • Essentially one long tube with two openings (mouth and anus) with accessory organs • Gastrointestinal tract: Mouth  Esophagus  Stomach  Small Intestine  Large Intestine  Rectum  Anus • Accessory organs: Salivary glands Liver gall bladder pancreas

  6. Tissues of the Digestive System • The entire digestive tract is lined with epithelial tissue • Goblet cells secrete mucus • Mucus protects the tract from digestive enzymes, and lubricates the passage for the food • The tract also contains muscle which allows the food to be pushed along the tract (peristalsis) Warning... Gross video ahead

  7. Mouth • Starting point of digestion • Mechanical digestion: Mouth and Tongue – break apart Food • Chemical digestion: Saliva – Saliva contains enzymes that break down food. Saliva also lubricates the food. • Once broken up, the food (now a bolus) is swallowed

  8. Esophagus • Long tube surrounded by muscle • The muscle contracts and relaxes to push food along toward the stomach (peristalsis)

  9. Stomach • Muscular organ that holds and churns food to continue the process of digestion • Strong acids (Hydrochloric acid HCl) and enzymes are secreted in the stomach to digest food • Acid that splashes up into the esophagus is the cause of heartburn

  10. Small Intestines • Small intestine is actually quite long – approximately 6m • Partially digested food that leaves the stomach is further digested • Nutrients are absorbed

  11. Large Intestines (Colon) • Large intestine are about 1.5m in length, but larger in diameter than S. Intestine • Water is reabsorbed • Trillions of bacteria live in your colon • They provide you with vitamins (K, and biotin)

  12. Warning – Frog picture ahead

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