Investigating+the+respiratory+system

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

When you pull the stretched balloon the balloon inside the cup gets more air inside, this happens because the air is like getting refilled

Push up on the stretched balloon. What happens inside the cup When you push up the stretched balloon the balloon inside the cup deflates, because it does not have as much air inside the cup.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon?

Less, because the balloon takes up most of the space inside the cup. Try the investigation again and observe more closely.

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

The balloon inside the cup, because that balloon expands inside the cup which causes the balloon to take almost all of the space. Wasn't the balloon always in there? What filled the extra space? Isn't there space inside the inflated balloon? Is there the same amount of space inside the inflated balloon as there was before it inflated? So what is filling the space?

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.

When you take breath e in the lungs get smaller and when you let the air out the oxygen goes out the lungs form back to normal size. Repeat the experiment and rethink your answer. Tell me about the air pressure.