1. The respiratory system

2. You breathe in. You breathe out. But what's happening inside? Your lungs are in your chest. You have two lungs, but they aren't the same size. This extra space on the left leaves room for your heart. The diaphragm is a muscle that works with your lungs to allow you to inhale (breathe in) and exhale (breathe out) air.diaphragm

3. Your lungs are protected by your rib cage.

4. Breathing air is necessary for keeping humans alive.

5. Your lungs are amazing. They allow you to breathe, talk to your friend, shout at a game, sing, laugh, cry, and more!

6. Your lungs are important for breathing... and also for talking! Keeping your lungs looking and feeling healthy is a smart idea, and the best way to keep your lungs pink and healthy is not to smoke. You can also show your love for your lungs by exercising!

7. From the outside, lungs are pink and a bit squishy, like a sponge.

10. a system of organs used in breathing that in human beings consists of the nose, trachea, bronchus, bronchioles, alveoli, diaphragm and lungs