BALLOON LUNG
You breathe about this many times every single day without thinking about it
20,000 times
This muscle below your lungs does all the work of breathing
The diaphragm
When the diaphragm pulls down air does this
Rushes into your lungs
In our model the bottom balloon represented this body part that controls breathing
The diaphragm
Hospital machines that breathe for sick patients use this same idea as our balloon model
Ventilators