How+Breathing+Works+3

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

Push up on the stretched balloon. What happens inside the cup? The balloon deflates then when I let go it inflated with air.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? Less because the balloon filled with air. There is more because the big balloon pulls down to create more space so the balloon can fill up.

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

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 your diaphragm contracts leaving more room for the air to fill in.

Markell, good job! I would encourage you to repeat this investigation (come see me to get a model) and rethink the question under EVALUATE. You obviously took your time on this.