Lung

Imagine two big, pink balloons inside your chest. Those are your lungs! They are super important because they help you take in air, which is like food for your body. When you breathe in, your lungs get bigger, and when you breathe out, they get smaller. They work all the time, even when you're sleeping!

Long, long ago, even before dinosaurs, animals started to figure out how to breathe air. Fish that lived in shallow water began to develop ways to gulp air. Over millions of years, these air-gulping abilities turned into lungs, just like yours! It’s like they went to breathing school and got smarter and smarter.

Your lungs are like tiny powerhouses. They take the good stuff from the air, called oxygen, and send it all over your body. Oxygen helps your muscles move, your brain think, and your heart beat. Without your lungs, you wouldn't be able to run, jump, or even giggle! They are truly essential for life.

When you breathe in, air goes down a tube called the trachea, which splits into two smaller tubes, one for each lung. Inside your lungs, these tubes get smaller and smaller, like branches on a tree. At the very end are tiny little sacs that grab the oxygen from the air and let the yucky air (carbon dioxide) go back out when you exhale.