10 Fun Facts About the Human Lungs

fun facts about the human lungs for kids

Your lungs are powerhouse organs that work hard to keep you alive. Check out these fun facts about lungs and prepare to be surprised!

Lungs and breathing

When was the last time you stopped and thought about your breathing?

doctor listening to child's lungs and breathing

Since you breathe in and out all day long, you probably don’t realize how hard your lungs are working – unless you get out of breath from playing or exercising!

The lungs are part of your respiratory system, and they work with your circulatory system to bring oxygen to your muscles and other organs. As blood travels through your body, it goes to the lungs, picks up the oxygen you breathe in, and then takes it to the rest of your body.

Your blood also carries carbon dioxide to your lungs so you can breathe it out.

Sometimes, doctors use special tools like stethoscopes and X-rays to check how your lungs are doing. Because the human lungs do amazing things in your body, learning more about your lungs can help you healthy.

10 fun facts about lungs that might surprise you

Which of these lungs facts have you heard about? Which facts are new to you?

1. Your brain controls your breathing

brainstem medulla oblongata labeled anatomy diagram

Your brain is the boss of your body, because it controls everything from your heart beat to your hands and feet.

Since the brain monitors your breathing when you’re awake and asleep, it’s called an “automatic” body function.

Which part of your brain controls your breathing? The very bottom of your brainstem, actually!

The lower part of the brainstem has a section called the medulla oblongata. This is the breathing control center of your brain.

2. Your lungs are much bigger than you think

Did you know that your lungs fill up most of your chest area? Since they’re packed into your chest inside the rib cage, you might not realize just how big they are.

Here are a couple of examples that may blow your mind:

  • If you cut open a pair of adult lungs and stretched them until they were completely flat, they would cover a tennis court. (But please don’t try this at home!)
  • The airways (“tubes” where the air flows through) of both lungs could stretch out to around 1,500 miles.
Fun facts about the lungs: the right is better than the left, and the diaphragm muscle helps the lungs breathe.

3. One lung is bigger than the other

Lung anatomy is a little different on each side. Your left lung is a little smaller than your right lung, because the left side needs extra room for your heart.

That’s also why the right lung has 3 sections called “lobes,” but your left lung only has two.

4. The lungs need help from neighbors

Like most things in life, the lungs depend on friendly neighbors. They can’t do the work of breathing on their own.

The lungs need help from a wide and thin muscle under the lungs called the diaphragm. The diaphragm muscle pulls air into the lungs. This big muscle also pushes air out of the lungs.

All of the muscles between the rib cage also help your lungs breathe air in and out.

5. Mucous lines your lungs

Mucous is a slimy substance inside your important organs, and its job is to protect your organs and keep out bad stuff. Inside your airways and lungs, you have a layer of mucous to catch dirt, dust, and bacteria.

Normally, your mucous color is thin and clear. When you get sick, sometimes the mucous inside your nose, airways, and lungs can get thicker and change color.

6. Your airways are like tree branches

tracheobronchial tree trachea bronchi bronchioles

Close you eyes and picture an upside-down tree. Now look at the anatomy picture. Does it look familiar? The airways that connect your throat to your lungs are like a tree:

  • The trachea is like a thick tree trunk.
  • The left bronchus and right bronchus are like big branches off the tree trunk.
  • And all of the bronchioles are like little tree branches.

As with all parts of your body, there’s a long, fancy medical name for your airways: the tracheobronchial tree!

Can you say tracheobronchial (TRAY-kee-oh-BRAHN-kee-ol) tree?

7. You breathe out both air and water

It’s true: invisible water molecules are in the air we breathe and also the air in human lungs.

When people breathe out air, they also exhale (breathe out) a little bit of water in the air. Although it’s a small amount, over the course of the day, it adds up to about 1 cup of water.

Make sure to keep drinking water to avoid dehydration!

8. You can live with one lung

Fun fact: you can live with only one lung!

Can you live with no lungs? Nope.

But can you live with just one lung? Why, yes you can!

Sometimes, if one of the lungs is sick and not doing well, surgeons can take that lung out of the body.

The healthy lung that’s left behind can usually do the job of breathing in oxygen and breathing out carbon dioxide. In fact, that solo lung actually gets bigger and takes up some of the missing space in the chest.

With one lung, a person can live a pretty normal life. But exercising might be harder and a little slower than before.

9. Your lungs help you float

Try this simple experiment with a beach ball or balloon. When a ball or balloon is deflated, it will most likely sink in water. But when they are filled with air, they Did you know that your lungs can help you swim like a fish? When you take a deep breath, the lungs fill with air.

10. You take 20,000 breaths each day

Your breathing speeds up when you move around and slows down when you sleep, but your lungs work all day and night. Even single minute, you breathe in and out around 12 times. In a day, this adds up to around 20,000 breaths. Whoa!

Which of these lung facts surprised you the most? Share these lung facts with your friends!

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Learn more fun facts about the human lungs

Updated on April 15, 2023 by Betty Choi, MD

Updated on April 15, 2023

by Betty Choi, MD