Investigate+what+makes+you+breathe+2

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

The air gets trapped in side the cup and so the balloon starts to be still.
You should have notice the balloon filling with air and expanding. Push up on the stretched balloon. What happens inside the cup ? It's forces come together and they push the balloon from the tiny little seal in the air flows in making it blow.

The balloon collapsed as all the air was "sucked" out it.

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

There is less space becasue it has moved more force.
Think about it and observe it again; there is actually **more** room.

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

It filters the air pressure in the extra space in the cup.
Air from outside the cup fills the extra 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.

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It's similar becasue it goes in and out and it's like the balloon. When you breathe into your lungs it makes you live. And when the air comes into your lungs they get big and smaller when you let the air out.======