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Digestive System

With this experiment kids learn what makes up our digestive system and function of each part in it. This experiment uses easily available things like straw, ziploc bag, scissor, construction paper, crackers, yarn and more.

Finished model of the digestive system!

Lesson Plan: Two activities to show how stomach breaks down food and labeling the organs of the digestive system. 

Activity 1: How the Stomach Digests Food

Materials needed:

  • 4 Crackers

  • 1 Ziploc bag

  • Clear Soda

  • 1 Sharpie


  1. Draw a stomach on the ziploc bag using a sharpie. 

  2. Break the crackers into small pieces and put all of them into the bag. [Represents food intake from our mouth into our stomach.]

  3. Add clear soda to the bag. [Soda represents stomach acid.]

  4. Seal the bag.   

  5. Now holding the bag in your hands, continue to break the crackers in the bag.

  6. Observe how the soda helps digest the crackers. [Represents how the acid in our stomach breaks down food]

Activity 2: Organs of the Digestive System
Materials needed:

  • 1 Construction Paper

  • 1 piece of yarn 3-4 feet long

  • Tape

  • 1 Straw with bendy top, 4 inch long

  • 1 Scissor

  • 1 Sharpie

  • 1 White Pencil

  • 1 Skittle

  • Paper cutouts: stomach, liver, large intestine, pancreas


  1. Draw human body outline on the construction paper using a white pencil.

  2. Tape the straw to represent the mouth and esophagus on the outline. 

  3. Cut out the stomach, pancreas and liver on the provided cutouts.

  4. Tape in the following sequence; stomach, large intestine, liver and the pancreas on the human body outline. 

  5. Take the yarn and crumple it underneath the large intestine. The yarn represents the small intestine. 

  6. Tape the skittle to the left of the pancreas.

  7. Label each organ as shown.  



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