Breathing+investigation

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

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

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon?
 * There is less space Rethink your answer; maybe perform the exploration again. **

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup?
 * The small balloon The balloon was always in there. So what is filling up the extra space in the cup when you pull the large balloon down? **

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. How is the air pressure similar?
 * The project was simalar because the small balloon acted as the lungs and the large balloon acted as the diphagram. When you breath air in, your lungs inflate while the diphagram decreases and vice versa.**