Understanding the Digestive and Respiratory Systems: A Hands-On Learning Experience

materials • 6 funnels/cardboard tubes • 6 droppers • Cups • Food • Food coloring • Bags • Hose • Paper towels

Warm-up • Write the question and the answer you choose. How do the respiratory and circulatory systems work together? • The respiratory system takes in carbon dioxide, while the circulatory system delivers it to the cells. • The circulatory system takes in carbon dioxide, whiles the respiratory system delivers carbon dioxide to the cells. • The respiratory system takes in oxygen while the circulatory system delivers oxygen to the cells. • The circulatory system takes in oxygen, while the respiratory system delivers oxygen to the cells.

RULES • If you get out of your seat, you will be removed from the class. • If I am talking, you ARE NOT. • The materials are not for playing but for learning. • You have guided notes that must be filled in as we move through the lab.

Let’s make poop! • In your group, mash the food in your cup with your utensil • Add couple of drops of water • What do you think this represents?

Step 1: The Mouth • Digestion begins in the mouth • Saliva (spit) contains an enzyme called amylase which starts breaking down the food.

Making poop continued • Funnel the food in your cup into your cardboard tube • One person needs to push the food down the cardboard into the baggy • Knead your baggy What does the cardboard represent? The bag?

Step 2: The Stomach • Pushing food down the esophagus is called peristalsis • Your stomach breaks down food by churning and using enzymes, stomach acid, and mucus. The new mixture is called chyme. • The gall bladdercreates bile which breaks down fat • Add food coloring to the mixture to represent these 3 things!

Making poop… • Push the mixture in the baggy to the corner • Add green food coloring (Bile) • Your mixture is now called chyme • Cut a hole in the corner and pour into the hose (over the paper towels!)

Step 3: The Small Intestine • Your food has now entered the small intestine! • Nutrients are now taken through the villi • Blood vessels send it to the body

Making poop… • Set the small intestine on a paper towel • What does the paper towel do? • What does this represent?

Step 4: The Large Intestine • Here, water is drained from the excess waste • If there is not enough time for water to be absorbed-diarrhea • Too much water absorbed-constipation

And we have… • POOP!!

Clean up procedures • If you are person: • 1- get a new cup • 2-get a new baggy • 3- get a new cardboard role • 4-pantyhose and place the tray back on the counter

Homeostasis • In your notebook, write how the digestive system maintains homeostasis.

Digestive System Review • When a description appears, decide as a group which vocabulary word goes with that definition and hold up your board.

The place digestion begins • Mouth

What is the enzyme in saliva that breaks down food? • Amylase

The part of the digestive track that moves food from the mouth to the stomach • Esophagus

Breaks down food by churning and using mucus, enzymes, and acid • Stomach

Creates bile and breaks down fat • Gall Bladder

Part of the digestive track where nutrients are absorbed and sent to the rest of the body • Small intestine

Organ that filters out harmful toxins • liver

Structures in the small intestine that absorb nutrients • Villi

Organ that releases a hormone to regulate the amount of sugar in the blood • Pancreas

Part of the digestive tracks that absorbs water from the excess waste • Large Intestine

Name of the mixture in your stomach once it is churned and acid, enzymes, and mucus, have been added. • Chyme

Understanding the Digestive and Respiratory Systems: A Hands-On Learning Experience

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