How+Breathing+works+Investigation+22

OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup?. What happens inside the cup? The less air the balloon has it deflates. The more air the balloon has it expands. The cup has more room inside. You mentioned three things; what happens only when you pull down on the stretched balloon?

Push up on the stretched balloon. What happens inside the cup? The straw gets pushed up because the balloon is really tight and the cup has air in it but not the balloon.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? Less space because the little balloon expands which uses a lot of space. But didn't the balloon need extra space in order to fill up?

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup? The little balloon expands the more you pull the big balloon down. You didn't answer the question.

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. Say your lungs were the small balloon. When you take a deep breath your lungs (little balloon) get smaller. When you inhale the oxygen again, then your lungs (little balloon) expand again. When you take a deep breath, you ARE inhaling. What about the air pressure similarities?