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A very changing experience!

A trip through your digestive system. A very changing experience!. Digestion. Digestive System: a collection of organs that break down food so that it can be used by the body Two types of digestion : mechanical and chemical (demonstration)

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A very changing experience!

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  1. A trip through your digestive system A very changing experience!

  2. Digestion • Digestive System: a collection of organs that break down food so that it can be used by the body • Two types of digestion: mechanical and chemical (demonstration) • Enzymes: substances that break down large molecules so they are small enough to pass into the blood stream

  3. Mouth • Saliva: liquid (or spit) in mouth that contains enzymes breaks down the food making it mushy and soft • Teeth: break and grind food into small pieces • Tongue: pushes food to the back of the throat (pharynx) so you can swallow

  4. Esophagus • Long stretchy pipe about 25 cm long • Located next to the trachea • Lined with muscles that slowly squeeze food through

  5. Stomach • Stretchy ‘J’ shaped sack that is attached to the lower end of the esophagus • Does both mechanical and chemical digestion • Reduces food to a soupy mixture called chyme

  6. Small Intestine • Pancreas • Oval organ between • stomach and small intestine • Squirts biocarbonate into • chyme to protect the small • intestine • Muscular tube 2.5 cm in diameter, beneath stomach • Just over 6 meters long • Inside walls lined with villi, absorbs nutrients into the bloodstream • Liver • Large organ just higher • than stomach on right side • Makes bile • Stores nutrients • Breaks down toxins • Gallbladder • Small saclike organ • Stores bile made from liver • Squeezes drops of bile into • small intestines to • breakdown fat

  7. Large Intestine • Muscular tube about 1.5 meters long and 7.5 cm in diameter • Stores, compacts, and eliminates material that can’t be digested

  8. It will take that candy you just ate about 24 hours to make this changing journey through your digestive tract!

  9. Table Discussion Questions • What would happen if you didn’t have teeth and saliva glands? • What would happen if the stomach didn’t use both mechanical and chemical digestion? • Predict the outcome if your small intestine wasn’t lined with villi. • How would you explain the importance of the pancreas, liver, and gallbladder?

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