Question: How do the lungs work?

Alex Jaeger answered on 9 Nov 2015:

Lungs are weird! When you breath, your chest expands and allows your lungs to fill with air. This video shows how they work

The inside of the lung looks like an upside-down tree! The branches have these delicate pillows at the end called Alvioli that pass the oxygen to your blood! The picture here shows what I mean.