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THE DIGESTIVE SYSTEM

Discover how the digestive system provides energy to every cell in your body through processes like ingestion, digestion, absorption, and elimination. From the mouth to the large intestine, learn how nutrients are broken down and absorbed for optimal health. Explore the role of organs like the stomach, liver, and pancreas in processing food efficiently. Follow Harriet Hamburger's journey through the digestive system to understand the importance of proper nutrition.

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THE DIGESTIVE SYSTEM

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  1. THE DIGESTIVE SYSTEM Textbook P. 62-63 ENERGY! What does every cell in your body need? The digestive system gets the “fuel” to your cells!

  2. 4 Main Processes • Ingestion – food taken into the body. • Digestion – broken down into smaller bits • Absorption – nutrients move into our blood. • Elimination – solid waste is removed. • It takes 20-30 hours from ingestion to elimination.

  3. Mouth • Digestion begins with chewing • Saliva moistens and begins to chemically break down food. • The tongue is also involved in pushing food around and …. tasting!

  4. Esophagus • Tube that pushes food towards the stomach using waves of muscle contractions • There is a flap of tissue called the epiglottis that makes sure when you swallow, the food does not go into your windpipe…..usually it works!

  5. Stomach • Muscles of the stomach churn and mix the food – physical digestion • Stomach acids also break down the food – chemical digestion

  6. duodenum - the first part of the small intestine; it is C-shaped

  7. Small Intestine • 6 meters long! Large surface area! • Nutrients are absorbed into the blood stream by diffusion

  8. Pancreas • Adds enzymes to the small intestine (chemical breakdown of food)

  9. Liver and Gall Bladder • Liver – makes a liquid called BILE • Gall Bladder (small sac) – stores the bile • Bile is “squirted” into the small intestine to break down fats.

  10. Large Intestine • 1.5 meters long • Receives undigested food from the small intestine • Water is removed (absorbed through the lining)

  11. Elimination • Rectum – compacts and stores feces before elimination through anus.

  12. The Journey of Harriet Hamburger

  13. http://www.youtube.com/watch?v=DBMGJ40io4A

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