Breathing18

OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup?

When you push down the little balloon expands or simply gets bigger, there is air coming in through the straw. So there is much more room. I think that the area is getting filled up with all the oxygen. Push up on the stretched balloon. What happens inside the cup? When you push up the balloon has less room in the cup so the little balloon gets thinner. I think it gets thinner because there is much less space and air in the cup for the balloon to get any bigger. Rethink your adjective; does the balloon get thinner or does it collapse?

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? There is more oxygen inside the space because when you pull down there is more room inside the cup for air to come in through the straw.

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup?

The thing that fills the space in the cup is oxygen. There is air coming in through to straw because there is much more room in the cup. Is there just oxygen or all the other gases in the air, too.

COMPARE: How is the air pressure in the balloon similar to the air pressure in your lungs? Write down what you think happens when you breathe air into your lungs.

I think that when you breath into your lungs it is a similar process to the experiment. Where the when you breath in your lungs, your air sacs it will get much bigger and then you will exhale all of the oxygen. When you hold the breath in your lungs, the air sacs keep the same amount or oxygen and stay small. How is the air pressure similar in both the model and your actual lungs?