Breathing+investigation+01

OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup? Air goes into the the balloon from the straw.

Push up on the stretched balloon. What happens inside the cup? All air goes out the straw and the balloon has no air.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? There is more air when you pull this large balloon down.

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup? When you pull the large balloon down, the extra space is full with carbon dexocide. Bre, the extra space is actually filled with air which is mostly oxygen, not carbon dioxide.

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. It's simalir because the lungs work the same way. When you breath air in your lungs it's oxygenated, when you breath that same air out you breath out carbon dexcyde coming out of your mouth and in to the air around you. Your model didn't "breathe out" carbon dioxide. When your diaphragm pulls down, extra room is created in your chest cavities which allows air you're breathing in to fill up the lungs due to the extra room now available.