How+Breathing+works+4

OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup? What happens when you stretch the balloon is oxygen fills the empty space and the balloon must expand to hold it.

When you pull down slowly on the stretched balloon, the balloon inside is stretched also, creating more space for air to fill.

Push up on the stretched balloon. What happens inside the cup? When you push up on the balloon the extra air leaves and the balloon gets smaller inside.

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

There is more space.

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

When you pull it, oxygen 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. when you breathe, air fills your lungs. when you pull the large balloon, air fills the balloon. When you breathe, you have to push out carbon dioxide by exhaling.

Amelia, on your first answer I want you to think about the clarity of your answer. Two balloons were involved in this investigation. Which one expanded? Your remaining answers are very well thought out and articulated. Good job! Mrs. Escue