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Digestive System

Digestive System. HB&H Chapter 3.3 Pages 82-87. Functions. Digestive system fills three roles… Breaks food down into molecules the body can use Absorbs molecules into the blood Eliminates wastes from the body. Digesting.

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Digestive System

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  1. Digestive System HB&H Chapter 3.3 Pages 82-87

  2. Functions • Digestive system fills three roles… • Breaks food down into molecules the body can use • Absorbs molecules into the blood • Eliminates wastes from the body.

  3. Digesting • Digestion is the process by which you’re body breaks down food into nutrient molecules • Occurs in two ways… • Mechanical • Chemical

  4. Mechanical Digestion • Physically breaking down food into smaller, manageable pieces • Chewing with teeth • Churning of the stomach.

  5. Chemical Digestion • Chemicals produced by the body break food into chemical building blocks • Starch in bread is broken down to sugar molecules • Enzymes are proteins the speed up chemical reactions.

  6. Chemical Digestion • Chemical digestion occurs when… • Saliva mixes with food in mouth • Digestive juices in the stomach (such as Pepsin and hydrochloric acid) break food down into liquid form.

  7. Down the Wrong Tube • Esophagus is the muscular tube that leads from mouth to stomach and lungs • Epiglottis is a flap of tissue that covers your wind pipe

  8. Down the Hatch • Lined with Mucus, which makes food easier to swallow • Helps protect from bacteria • Muscles of esophagus contract to move food along, called Peristalsis.

  9. Stomach • Holds food until digested (mechanically & chemically) • Can hold about 2 liters • Leads to small intestine • Coated with mucus • Cells are replaced quickly.

  10. Exit Pass What are 2 of the 3 functions of the digestive system?

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