The Digestive System Lab. During this lab you will come in contact with food and other lab equipment. You may NOT eat any of the food or misuse any of the digestive system lab equipment. For this lab, we are going to use different objects to represent different parts of the digestive system.
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During this lab you will come in contact with food and other lab equipment. You may NOT eat any of the food or misuse any of the digestive system lab equipment.
For this lab, we are going to use different objects to represent different parts of the digestive system.
Water = Saliva
Banana = Stomach enzymes
Cocoa Powder = Gallbladder bile
Cracker = Food
Plastic bag = Stomach
Cup w/paper towel= Large Intestine
Pantyhose = Small Intestine
The class will be split up into groups of 7 people. Get into your groups now!
Each person in the group will have a job to do.
Teeth – pick up 2 crackers
Enzymes in saliva– pick up piece of banana
Saliva – fill beaker of water with 30 ml of water
Stomach – pick up Ziploc bag
Small intestine – pick up one pantyhose
Large intestine – pick up cup with paper towel
Gallbladder – pick up cocoa powder
Teeth – The person with the cracker – break your crackers into 4 pieces. Hold them in your hands and try not to get crumbs anywhere.
This is like chewing. Teeth are the first part of the digestive system. This is mechanical digestion.
.We will skip over the esophagus and go straight from the mouth to the stomach.
-What does the esophagus do?
The person with the Ziploc bag – hold the bag as we go. You are the stomach. The person with the crackers, Put the cracker pieces into the Ziploc bag.
The person with the water, pour a small amount of water into the bag.
-This is like the saliva from your mouth. The saliva adds taste and makes your food easier to swallow. It also has digestive enzymes.
The person with the banana put the piece of a banana into the bag.
-This is like the enzymes in your saliva that help break down the food.
The person with the cocoa powder, put a spoon full of cocoa powder into the bag.
-This is like the hydrochloric acid the stomach adds. This is chemical digestion.
The person with the Ziploc bag, squeeze out all the air and close the bag tightly.
-Make sure it is completely closed.
-If you leave air in there, it will be like what happens when you have gas.
Pass the bag around so that each person gets a turn. Each person, smash the cracker, banana, water and cocoa powder together for a few minutes.
-This is like the churning that the stomach does. This is mechanical digestion.
Get your stocking ready.
After your food is churned up, cut a very small hole in the bottom corner of the bag.
-You will need help for this!
We will now squeeze the food from the small intestine (stocking) into the large intestine (cup).
Each person take a turn and squeeze the food down the stocking a small bit until it has made its way to the bottom with the hole.
. Make sure the cup stays on the tray.
The cup has a paper towel in it to absorb the water just like the large intestine.
-The waste products—the parts of the food your body can’t use, will get packed together.
Pretend the trash can is the toilet and dump the waste products in, representing the end of the digestion process.
Cup with hole