This week’s topic was the digestive system. The kids (and I ) learned the basics of this important system of our body. We did a couple of digestive system experiments and watched a short digestive system video. Here are the highlights:
I did an “old-school” visual aide for my class this week. This was a printable from Human Body: Easy Make and Learn Projects. Getting this ready brought back many memories of coloring teaching posters for my classroom years ago. I found it was kind of therapeutic to color in the poster.
The full poster is two standard-size pieces of paper taped together. There are little flaps to lift with information. I used this to show what happens to food when eaten.
After using the poster, I showed a short video clip on my iPad for the class. I thought it was funny.
We did an experiment to see how the enzymes in our saliva work to break down starches (found in the Apologia book.) We first had a small piece of cracker that we placed in our mouth. We observed how this started breaking down and how it tasted a little sweet. Next we tried again using cheese. The cheese did not break down as easily as the cracker and there was no “sweet” taste because cheese is a protein, not a starch.
Next we made a model of the stomach. I rolled a piece of paper to be the food tube, and taped one end into a quart size plastic bag. Then I added some water to be the stomach acid.
I had each kid move a piece of bread through the food tube (they were simulating the involuntary muscles that move food in our esophagus.)
We observed how the bread was starting to break apart just by sitting in the water. We discussed how the stomach acid works to break down the food, but that our stomach has 3 layers of muscles that churn the food. Yes, this looks gross. From there we reviewed what happens to the food after it is churned in the stomach. Then we read the from My First Human Body Coloring Book.
I created a digestive system worksheet and a take-home sheet. I’m gathering all the past posts and links and organizing them on the Human Anatomy page. You can easily find the links and downloads there for all that we have done so far.