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Home » Science Experiments for Kids » Biology » How Do Lungs Work? Make A Model Lung

How Do Lungs Work? Make A Model Lung

Modified: Sep 17, 2024 · Published: Aug 12, 2018 by Emma Vanstone · This post may contain affiliate links · 36 Comments

The lungs are an essential organ for all mammals. Lungs have several features which make them perfect for exchanging gases.

  • a very large surface area, thanks to a network of small tubes and tiny air sacs called alveoli.
  • they are moist
  • and have a good blood supply

Today, we’re going to find out how lungs work by making a lung model.

The lungs are part of our breathing system, which has two functions:

  • ventilation – the movement of air into and out of the lungs
  • gas exchange – gases are exchanged between tiny sacs called alveoli and the blood.

Under the lungs is the diaphragm, a muscular sheet separating the lungs from the abdomen. The diaphragm moves up and down to increase the space in the chest, like the balloon at the bottom of the model.

How do lungs work - lung model for kids made with half a plastic bottle, straw, and a balloon
Lung Model

To make a model lung you’ll need

  • A plastic bottle
  • A straw
  • An elastic band
  • Scissors
  • Two balloons
  • Play dough

The bottle acts like the chest cavity, the balloon at the bottom is like the diaphragm and the balloon in the centre is like a lung.

Instructions for making a model lung

  1. Carefully cut the bottle roughly in half. Ask an adult to help. Discard the bottom half.

2. Tie a knot in one end of one balloon and cut off the opposite end.

3. Stretch the balloon around the bottom of your plastic bottle.

4. Place a straw in the neck of the other balloon and secure it tightly with the elastic band but not so much that you crush the straw. The air must flow through, so test it with a little blow through the straw to see if the balloon inflates.

5. Put the straw and the balloon into the neck of the bottle and secure them with the play dough to make a seal around the bottle – make sure that again, you don’t crush the straw, but air can flow through.

How lungs work - easy lung model for kids

Hold the bottle and pull the knot of the balloon at the bottom. What happens?

You should find that the balloon inside the bottle inflates, and as you let go the balloon deflates.

Easy balloon lung model for kids

Why does this happen?

As the knotted balloon is pulled it creates more space inside the bottle. Air then comes down the straw and fills the balloon with air to fill the space! This is like breathing in.

When you let go of the knot the space no longer exists, so the air from the balloon is expelled making it deflate.

Inside the lungs is a network of tubes which allow air to pass through. Air is warmed, moistened and filtered as it travels through the mouth and nasal passages. It then passes through a network of tubes, eventually reaching tiny sacs called alveoli which is where gas exchange occurs.

How do lungs work?

This lung model demonstrates how the lungs work. Air is taken in through the mouth and nose, passes down the windpipe and into the lungs. The diaphragm at the bottom of our chest moves down to create more space. As we breathe out the diaphragm raises again. The knotted balloon represents the diaphragm and the balloon inside the container represents a lung. That’s how lungs work!!

Girl holding a model lung made from a plastic bottle and balloon

More ideas for learning about the lungs

Create a labelled diagram of the gas exchange system.

labelled diagram of a lung model

Use balloons to make a very simple model of the lungs.

very simplified lung model made with balloons

More human body science ideas

Create and build a DNA model from candy

Try this super simple heart rate investigation.

Make your own stethoscope with a cardboard tube, tape and a funnel.

If you liked this post, we’d love you to follow us on Facebook, where we post fun science ideas daily!

If you enjoyed this activity, do check out my other easy science investigations for kids of all ages.

Last Updated on September 17, 2024 by Emma Vanstone

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Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

Reader Interactions

Comments

  1. Liz Burton

    April 13, 2012 at 11:39 am

    Very cool – even if it does make me feel a bit queasy!

    Reply
    • Ellie

      December 09, 2013 at 5:41 pm

      I know how you feel.They could have chose a less effective colour.

      Reply
      • dinnie

        January 17, 2014 at 8:57 pm

        yea

        Reply
  2. Sarah Avila

    April 15, 2012 at 1:26 am

    I have made this with my oldest son! It’s really neat; I plan to do it with all my kids when we study anatomy!

    Reply
    • ScienceSparks

      April 15, 2012 at 1:39 pm

      I’m so glad you liked it!

      Reply
  3. Hannah

    April 16, 2012 at 10:10 pm

    Very cool. Now to remember this when Bunny is a little older! My “No Time for Flashcards” post is a look at our week of playschool– http://www.notimeforflashcards.com/

    Reply
  4. Carrie

    April 17, 2012 at 7:05 pm

    What a great demonstration!! Thank you for sharing at Sharing Saturday!! I hope you are having an amazing week!

    Reply
  5. Pinkoddy

    April 18, 2012 at 9:59 am

    That is seriously impressive. My get my husband to make one with our 8 yr old.

    Reply
  6. Emily

    April 19, 2012 at 11:16 am

    This is excellent, thank you. My son and I have just started exploring science at home and this site is wonderful. I’m so glad you link up to Sharing Saturday, thank you.

    Reply
  7. Isil

    April 19, 2012 at 1:51 pm

    Great way to teach science! Thanks for linking up to Kids Co-op.

    Reply
  8. Alissa @ Creative WIth Kids

    April 20, 2012 at 1:28 pm

    So Cool! This is the first time I’ve understood how a lung works. Thank you for giving me my weekly science lesson 🙂 Nominated you for a MAD award, btw. Thanks for sharing on Kids Get Crafty! ~Alissa and Maggy

    Reply
  9. Mama B

    April 21, 2012 at 1:11 am

    I am new to your site and really like it! I pinned the how to make a lung idea to my learning ideas board – what a great idea…can be used in so many ways! Thank you!

    Reply
    • ScienceSparks

      April 22, 2012 at 9:48 pm

      Thank you for pinning. xx

      Reply
  10. Aimee

    April 21, 2012 at 2:13 am

    I just wanted to stop by to tell you that this is so awesome it is being featured this week on the The Sunday Showcase Have a wonderful week-

    Aimee & Bern

    Reply
    • ScienceSparks

      April 22, 2012 at 9:48 pm

      Thank you so much. xx

      Reply
  11. Amy

    July 23, 2012 at 3:24 am

    This is a great idea! And it would work well to show the effects of smoking too. Use a wide straw (like one from McDonald’s) to fill the lung, then feel the difference in how fast or easily the lung fills using a narrow straw (like a tiny one for stirring coffee). I will for sure be doing this demo with kids! Thanks!

    Reply
    • ScienceSparks

      July 23, 2012 at 6:48 am

      Fab. I’m glad you liked it.

      Reply
      • Neha

        January 13, 2023 at 2:24 pm

        Thanks for sharing this video. This really helped in my school science fair. Thank you so much.

        Reply
  12. tracey

    January 28, 2013 at 11:58 pm

    You have to use a very sturdy water bottle for this project. My son and I went through many balloons trying to make it fit over a standard water bottle…..we ended up using a Snapple drink bottle because the plastic is stronger.

    Reply
  13. Missy

    October 21, 2013 at 2:30 am

    This looks great! We’ll be trying it this year when we learn about the respiratory system in our homeschool! Thanks for sharing!

    Reply
  14. Ellie

    December 09, 2013 at 5:44 pm

    I’m making this for a science project and I hope that I do it right!How clever!It must have taken a while to think of that.GREAT IDEA!

    Reply
  15. lovely

    January 24, 2014 at 8:45 am

    It is so nise but we have two lungs.but you have shown only one.

    Reply
  16. Becca

    March 24, 2014 at 11:40 pm

    Great demonstration, I just wanted to correct the following statement:

    “This demonstrates how our lungs work. Air is taken in through the mouth and nose, passes down the windpipe and into our lungs. The diaphragm at the bottom of our chest moves down dot create more space.”

    The diaphragm is the muscle that makes breathing happen. As it contracts and spreads flat in the abdomen, it creates a vacuum that draws air into the body. This model demonstrates how a vacuum works.

    Reply
  17. Leila

    August 29, 2014 at 2:02 pm

    This is so great. I teach flute and was looking for some kind of demo – this is perfect – if I can get mine to work as well as yours does 🙂

    Reply
  18. Aasiyah

    March 12, 2015 at 3:48 pm

    Awesome experiment! Did it with my school and didn’t understand the science bit…l thank you!!

    Reply
  19. Aasiyah

    March 12, 2015 at 3:50 pm

    Suggestions: Instead of using a balloon as the lung, you can cut off the fingers of a doctors glove and Sellotape it to a y tube. It’s much more accurate

    Reply
  20. Rose

    April 26, 2015 at 12:15 pm

    It can be difficult to find plastic bottles that hold up to having a balloon stretched across the bottom. They all seem too thin. Can anyone suggest brands?

    Reply
    • Emma Vanstone

      April 29, 2015 at 10:28 am

      I’ve redone this recently and used a diet coke bottle, but I did reinforce it with some masking tape.

      Reply
    • Esther

      July 19, 2019 at 9:20 pm

      Use a strong plastic clear cup with a lip at the bottom. The balloon fits nicely over it.

      Reply
  21. saurabh

    June 07, 2015 at 2:09 am

    it is very easy to understand how they have discribe their eperiment i thank science aparks for this

    Reply
  22. alexis

    May 13, 2016 at 8:19 pm

    awesome!!

    Reply
  23. jess

    November 23, 2016 at 5:36 pm

    This s a great experiment, we did it with 10 year olds and really got them thinking – easy and clear – thanks for the clear instructions 🙂
    Just in case you want to know – few spelilng errors noticed – of not off and ballon and bow not blow.. x

    Reply
  24. Emma Williamson

    November 25, 2018 at 8:22 pm

    This looks like an absolutely perfect model for some school activities. I’ll definitely use it with my kids.

    Reply
  25. MsWiz

    November 28, 2018 at 6:09 pm

    Must have a strong 2 liter bottle. Many are too bendable

    Reply
  26. Ressenia

    January 28, 2019 at 1:24 pm

    This project is so cool I’m doing one for my project

    Reply
  27. PrimaryLearning.org

    October 23, 2019 at 1:33 pm

    Wow! Thank you for sharing such a great activity! I’ll share it on my facebook page.

    Reply

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