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Why do large food molecules, like some complex carbohydrates, seem to disappear in the digestive system?
Lesson Objectives...
Analyze and interpret data to identify a relationship within the data that shows that the amount of certain food molecules (complex carbohydrates) decrease, and other food molecules (glucose) increase as they move through the mouth, which is a correlational relationship. Students argue that we need more data to determine the cause of the observed increases and decreases in food molecules.
Plan and conduct an investigation to produce data to determine whether food containing complex carbohydrates, but not glucose, undergoes a chemical reaction in the mouth and that this reaction turns the complex carbohydrates into glucose when mixed with a substance found in saliva (amylase), which is identified by a pattern change in the color of the food indicator.
Resources for Lesson 5...
Resources for Lesson 5...
Predict: What will happen (in our mouths) when we eat a cracker?
Predict: What will happen (in our mouths) when we eat a cracker?
We are going to slowly eat a cracker to make observations about what happens to a complex carbohydrate in the mouth. Record your observations in your science notebook.
Make Observations: What happens to the cracker in the mouth?
Make Observations: What happens to the cracker in the mouth?
Watch a video of someone eating a cracker and make observations about what happens to the cracker when it is in the mouth.
Analyze Data from Eating a Graham Cracker
Analyze Data from Eating a Graham Cracker
Analyze the data to record what is happening in each location. Record in your science notebook whether or not the food molecule goes up (↑), goes down (↓) or stays the same (=).
What's Spit?
What's Spit?
Read the article "What's Spit?", and respond to the questions in your science notebook.
Plan and Conduct an Investigation to Test for Chemical Reactions in the Mouth
Plan and Conduct an Investigation to Test for Chemical Reactions in the Mouth
Read Parts 1 - 3 of Chemical Reactions in the Mouth Investigation (below). Complete the information needed in your science notebook for planning your investigation, planning your procedure, and your prediction of what you think will happen.
Plan and Conduct an Investigation to Test for Chemical Reactions in the Mouth
Plan and Conduct an Investigation to Test for Chemical Reactions in the Mouth
Read Parts 4 - 6 of Chemical Reactions in the Mouth Investigation (below). Complete the information needed in your science notebook for conducting the investigation, recording your results, and recording your interpretation. The conducting the investigation was recorded in the video below. Use the video to record your results.
Rice - Test for Chemical Reactions in your Mouth
Rice - Test for Chemical Reactions in your Mouth
The video shows the Chemical Reactions in your Mouth Investigation using rice as the food.
Cracker - Test for Chemical Reactions in your Mouth
Cracker - Test for Chemical Reactions in your Mouth
The video shows the Chemical Reactions in your Mouth Investigation using a cracker as the food.
Taco Shells - Test for Chemical Reactions in your Mouth
Taco Shells - Test for Chemical Reactions in your Mouth
The video shows the Chemical Reactions in your Mouth Investigation using taco shells as the food.
Results of the Chemical Reactions in your Mouth
Results of the Chemical Reactions in your Mouth
The image shows the results of the Chemical Reactions in your Mouth Investigation. Record the results and your interpretation of the results in your science notebook.
What we figured out this lesson...
What we figured out this lesson...
Some types of complex carbohydrates decrease in the mouth while glucose increases.
Chemical reactions that occur in the mouth break down some types of complex carbohydrates into glucose, and no matter disappears when this happens.
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