How+Breathing+Works+28

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

Push up on the stretched balloon. What happens inside the cup? The balloon inside fills up whith air and gets bigger.

Kyle, you might want to borrow a model of the lung and try this step again. Observe more closely. If the balloon "sucks up all the air," won't it be fully blown up? Is that what you saw?

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

There is more space inside the cup.`

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

the air pressure is similar because when oxygen goes into the lungs it inflates so no oxygen blood can get out oxygen, so it inflates.

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