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 ID: 588626
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Slide1
The Digestive System LabSlide2
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.Slide3
For this lab, we are going to use different objects to
represent
different parts of the digestive system.
Cracker = Food
Cup w/paper towel= Large Intestine
Pantyhose = Small Intestine
Water = Saliva
Banana = Stomach enzymes
Cocoa Powder = gastric juicesSlide4
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.
Job
Teeth – pick up 2 crackers
Enzymes in saliva– pick up piece of banana
Saliva – pick up cup of water
Stomach – pick up Ziploc bag
Small intestine – pick up one pantyhose
Large intestine – pick up cup with paper towel
Rectum – pick up cocoa powderSlide5
Newspaper
There is newspaper available to cover your table. Please make sure your table is covered before you start. Slide6
Step 1
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. Slide7
Step 2
.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.
Slide8
Step 3
The person with the banana put the piece of a banana into the bag.
-This is like the enzymes that help break down the food.
+Slide9
Step 4
The person with the water, pour a small amount of water into the bag.
-This is like the saliva from your mouth
+
+Slide10
Step 5
The person with the cocoa
powder,
pour the
cocoa powder
into the bag.
-This is like the gastric juices the stomach adds.
+
+
+Slide11
Step 6
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.Slide12
Step 7
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.
Return the bag to its
original owner.Slide13
Step 8
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!Slide14
Step 9
The person holding the stocking, get help cutting a small hole in the bottom of your stocking.
The person holding the Ziploc bag, pour the food from the stomach (bag) into the small intestine (stocking).
Watch as all the water from your food goes through the wall of the small intestine.
This water will now go to the rest of your body where it is needed.Slide15
Step 10
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.
. The person holding the cup - the cup will have a small hole in the bottom so make sure you are holding your cup over the tray on your table!Slide16
Step 11
The person holding the cup is now holding the cup over a 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.Slide17
Step 12
Pretend the trash can is the toilet and dump the waste products in, representing the end of the digestion process.Slide18
Time to Clean up!
Throw away…
Ziploc bag
Pantyhose
Newspaper
Cup with hole
Paper towel
Rinse and put back…
Water cup
TraySlide19
Discussion Questions
What did adding the banana and water do?
What besides water seeps out of the small intestine (pantyhose)?
What organ did we not include in this lab?
What could we have used to represent that organ?Slide20
Digestive System Movie