Breathing

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

The air in the balloon floats to the top and the less air it gets the balloon deflates the more air it gets the more it expands. So what happened to the little balloon inside the cup when you pulled down on the flat, stretched balloon?

Push up on the stretched balloon. What happens inside the cup?

The air in the balloon floats to the top and the less air it gets the balloon deflates the more air it gets the more it expands. EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? Less because the balloon is expanding! Think about this again; you're pulling down on the large balloon. IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup The little balloon fills the space up. With **__what__**?

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 breathe in your chest expands and with the balloon when you pull down the large balloon it expands just like your chest. And when you breathe out your chest goes in and the big balloon pushes in like your chest. When you breathe air into your lungs your lungs get smaller and hen you breathe out your lungs get bigger and back to normal size. Now you've got it!