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Cracker Digestion Experiment: Chemical vs. Mechanical Digestion

Explore the differences in digesting a cracker using chemical and mechanical processes. Conduct an experiment and analyze the results to understand digestion better.

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Cracker Digestion Experiment: Chemical vs. Mechanical Digestion

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  1. Using the slides. Record information for each system in your journal title and write the hint if you don’t already have it.(only red words need written in your notes) • Excretory system (Urine exits the body) is person #9 What is the Function and organs involved in this system? • Digestive system (digests food) is person # 10 What is the Function and organs involved in this system?

  2. Digestive/Excretory System • Without my system, the body would not be able to obtain energy and nutrients. • I break down all the food stuffed in my mouth into usable nutrients and expel the wastes.

  3. Excretory System (urine Exits) Function • Filterswaste from blood • Eliminates (gets rid of) these waste products as liquid waste

  4. Excretory Organs • Kidneys – filters your blood up to 400 times a day removing waste • Ureters – connects the kidneys to the bladder • Bladder – Stores liquid waste until it is ready to be released • Urethra – guides the liquid waste out of the body

  5. Digestive System Function: • Breaks down food into pieces small enough to be absorbed into our blood • These small molecules of food can be taken into our cells to be used for making energy

  6. H2O becomes O+ H H • During digestion complex compounds such as sugar or starch is broken down into simpler compounds for the body to absorb.

  7. Digestive Organs • Mouth – chews food to break it into smaller pieces • Esophagus – moves food from the mouth to your stomach using smooth muscle (think tube of toothpaste) • Stomach – mixes and crushes food into smaller pieces, secretes substances to break down food chemically and kill bacteria

  8. More Digestive Organs • Small Intestine – chemical digestion breaks food down into particles small enough they can be absorbed into the bloodstream, where most nutrients are absorbed • Large Intestine – absorbs water and nutrients, processes remaining waste to be eliminated from the body

  9. Digestive System • Types of Digestion • Mechanical – food being physically broken down into smaller pieces (chewing, peristalsis in the stomach) • Chemical – large molecules of food broken down into smaller molecules by substances made in the body (stomach acid, enzymes)

  10. Cracker Lab • You will be examining the differences between chemical and mechanical digestion. You will be taking 2 bites of your cracker. Use an online stopwatch • Make sure you take 2 even bites • Eat one bite of the cracker using only chemical digestion (saliva) record how long it takes for it to liquefy/digest • Eat another bite using mechanical digestion (chewing) and chemical digestion (saliva) record how long it takes for it to liquefy/digest. • Write the answers on the digestion page. • Which method was quicker? • Which did a better job? • Why do you think this? Support your opinion with evidence from the cracker lab.

  11. In your notebook on the left page, across from your digestive system.Create a minimum of SIX step illustration with description of what this cracker will now experience going through your digestive system. AKA. the process of digestion.EXAMPLE: step one teeth tear and grind food down into smaller pieces and saliva enzymes in the mouth breakdown the starch in the cracker. • Digestive system video • http://kidshealth.org/en/kids/dsmovie.html to help you with your illustrations and identifying the steps of digestion.

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