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Learn about the similarities and differences between mechanical and chemical digestion in the digestive system. Explore the processes through notes, a presentation, videos, and hands-on activities. Complete a digestion lab and online simulation to deepen understanding. Engage in group discussions and complete an exit ticket to assess learning.

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  1. DO NOW

  2. Digestive System Notes Glue Note Sheet to pg

  3. Digestion Presentation Use your sheet to complete notes on the Digestive System. Digestion Prezi

  4. Do NOW What are the similarities and differences between mechanical and chemical digestion? Mechanical DigestionChemical Digestion

  5. Mechanical Digestion Mechanical digestion is the physical break down of food into smaller pieces.

  6. Mechanical Digestion EXAMPLE: CHEWING!

  7. Mechanical Digestion EXAMPLE: Peristalsis: The squeezing of muscles in the digestive system which forms a wave of constriction that moves food along.

  8. Chemical Digestion Chemical Digestion is the chemical break down of foods into simple molecules.

  9. Chemical Digestion Example: Enzymes in your saliva and stomach begin breaking up molecules in your food. Stomach acid (Hydrochloric acid) also breaks down fats, proteins, and starch into much simpler molecules as shown in this diagram.

  10. DO NOW

  11. Engage: Digestion 1. Put one cracker into your mouth. Hold it in your mouth for 10 seconds. Start recording your observations on your sheet. 2. Start to slowly chew the cracker. 3. Swallow the cracker. Pay attention to the way it feels to have the food travel down your esophagus.

  12. Turn and Talk With your elbow partner: Discuss which forms of digestion (mechanical/chemical) were involved in eating your cracker. Be prepared to describe your thoughts with the class.

  13. VIDEO Digestive System

  14. Digestion Lab Set-Up A- Lab Clean Up Director B- Beaker Manager C- Lab Director D- Materials Manager

  15. Digestion Lab Materials Managers: 1 Beaker with 150 mL of Cola 1 Ziploc bag 5 crackers 1 filter paper

  16. Digestion Lab • Place 5 crackers into a sealable bag. • Pour in 150 mL of cola into the bag and zip the bag closed. • Observe the crackers. Record any changes ln your sheet. • “Pump” the bag for three minutes. • Observe and record what happens to the crackers inside of the bag. • Place filter paper on top of the beaker. Use the rubber band to keep the filter paper in place. • Using the spoon, slowly pour out the cola and cracker mixture from the bag and into the filter paper.

  17. Exit Ticket Complete the questions on the back of your lab sheet.

  18. DO NOW

  19. ENGAGE: Why do we eat food? -TURN AND TALK -Be prepared to share

  20. EXPLORE: “Meet Your Food” JIGSAW EXPERT GROUPS: A- Report to Table 1/5 • Hamburger Patties (Protein) B- Report to Table 2/6 • Hamburger Buns (Carbohydrates) C- Report to Table 3/7 • Cheese (Fats) D- Report to Table 4/8 • Lettuce and Tomato (vitamins/minerals)

  21. EXPLORE: EXPERT GROUPS: Read the information assigned to your group. Prepare to share your information. 1)What large molecules are broken down when you eat your assigned food? 2)Where is it digested in the digestive system? 3)What smaller molecules are formed when the large molecule breaks down?

  22. EXPLORE: • Move back to your table group BUILD YOUR HAMBURGER: -Show your Hamburger Part to your table group -Share the molecules on the back -Place your Hamburger Part in the Center of the table and share your information (LETTUCE< PATTY< CHEESE< BUN)

  23. EXPLAIN: Digestion Online Simulation You and a partner will use the online simulation to complete the “Journey Through the Digestive System” Graphic Organizer Voice Level 1 as you work

  24. ELABORATE: QUESTION: Can ENZYMES and STOMACH ACID really digest large protein molecules into smaller AMINO acids. PROTEIN DIGESTION LAB: -Read the directions carefully -Complete the pre-lab when your test tubes are set up -Voice Level 2

  25. Digestion Lab Set-Up A- Lab Clean Up Director B- Test Tube Manager C- Lab Director D- Materials Manager

  26. Project Reminder • Due TUESDAY December 18th!

  27. EXIT TICKET: • Pretend you are a green bean. Describe your journey through the digestive track using as many vocabulary words from your notes and lab as possible. • Underline the vocabulary words from this lesson

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