breathing+23

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

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

The balloon inside the cup deflates when you push the stretched balloon up.

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

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

When you pull down on the large balloon the space fills with air
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.

What I think happens in the lungs is the oxygen pushes the lugs in and out, in and out. Ryan, you've made an observation based on the knowledge that the small balloon represents a lung and the cup represents your chest cavity but you haven't thought deeply enough and answered the question regarding air pressure. How does air pressure help you breathe? How does the pressure in your body change as you breathe in or out?