Do you you think your lungs are just two big balloons? Well, you are wrong! This is what the inside of your lungs look like:

Your lungs have 300 million alveoli surrounding them, and many bronchioles connected. The diagram above shows something that could resemble a family tree. The trachea splits into two bronchi, and the bronchi split into countless bronchioles.

Here are a few reasons why having alveoli, a tracia, two bronchi and many bronchioles is better than two “balloon” lungs:

For the alveoli, they have a more surface area to volume ratio
More surface area means a better exchange of oxygen and Co2
The trachea, bronchi, and bronchioles transport oxygen to the alveoli, that then transport oxygen all over your body

So next time someone tells you otherwise, tell them the truth!