1. Which statement best summarizes the steps are involved before sugar is able to enter the bloodstream?

• Food is mechanically and chemically broken down until nutrients enter the bloodstream and can be combined with oxygen to create energy we can use.
• Food is mechanically and chemically broken down until it becomes oxygen in the blood stream until we chemically break oxygen away from it to get energy we can use.
• Food and oxygen are broken down by the digestive system and they’re chemically combined to make sugar, which we can use as energy.
• We mechanically break down food until it turns into sugar and enters the bloodstream and can be broken down for energy we can use.

2. The process of converting sugar into energy we can use is called .

3. In order for food to be turned into energy we can use, it needs to be and then it will chemically react with which happens .

4. In this graph, we see a rise in the blood sugar of the patient and then it drops off to go back to normal. What’s the most reasonable conclusion we can draw from the drop in the level of glucose in the bloodstream?

• Some of the sugars were used as energy and some were stored for later use.
• The sugar was used as energy or converted into other molecules that were used immediately by the body.
• All sugar molecules were used as energy right after they were consumed.
• All of the sugar molecules were stored and none of them were used as energy.

5. One of your classmates makes the following claim about the data provided:



“We only see the rise and fall of the sugar levels in the body, so this must mean that snickers bars are almost all sugar.”



Evaluate this statement and correct any misconceptions they might have.

6. In the space below, draw a model to show the process a snickers bar goes through, from when it enters your digestive system, until it’s used by the body for energy.

7. Explain how your model shows what happens to that Snickers bar over time and how your body uses the molecules in the Snickers bar to get energy.

8. One of your classmates makes the following claim:



“Once we eat food, the energy we get from it can be used for all kinds of different activities, not just for moving muscles. If we don’t use some of the energy in the food we eat, our body can store it for later.”



Evaluate this statement and correct any misconceptions they might have.

9. In the space below, draw a model to show how a Snickers Bar gives you energy. Be sure your model shows how matter is conserved even as the candy bar is digested.