Respiratory System

Múinteoir Clíona's science lesson today was about the respiratory system.  The respiratory system is the group of the tissues and organs that work together to allow us to breathe.


1) Name the part of the respiratory system labelled 1 and 2 in this diagram

  1. _____________________________________________________________________________
  2. _____________________________________________________________________________

2) Fill the in blanks with the correct gas. 

  • We breathe in __________________________
  • We breathe out _________________________

3) Which diagram is inhale and which is exhale?

  1. __________________________________________________________________________
  2. __________________________________________________________________________

Send us pictures or videos of what you have done. Ask your parents to help you send them to

How to Make a Simple Model Lung

What you need: clear plastic bottle, two balloons, scissors, tape


  1. Very carefully cut the bottom off the bottle. Get a parent's help with this bit, it can be tricky.
  2. Push one balloon into the neck of the bottle and fold the neck of the balloon around the neck of the bottle.  This is your lung.
  3. Get the second balloon and snip the neck off it. 
  4. Stretch the balloon over the open bottom end of the bottle.  Secure it with a bit of tape.  This is your diaphragm. 
  5. To get your lung model breathing start by gently pulling down on the centre of the diaphragm. What happens to the balloon inside the bottle? As the diaphragm moves down your lungs should fill with air.  This is what happens when we inhale.
  6. Now let go of the diaphragm and push it up into the bottle gently. What happens to the balloon?  The lung deflates as the diaphragm moves up.  This is what happens when we exhale.

If you would like to do a bit more respiratory related experimenting, this is a great one from Hoopla Kidz Lab to figure out what your lung capacity is.

We need your consent to load this YouTube contentWe use YouTube to manage extra content that can set cookies on your device and collect data about your activity. Please review their details and accept them to load the content.Manage PreferencesSee who has the largest lung capacity in your house. People who have a large lung capacity can send oxygen around their body faster. You can increase your lung capacity by doing regular exercise.

Fun Lung Facts

  • An average person breathes in over 9,000 litres of air every day.
  • The lungs are the only organ in your body that can float on water.  Each of your lungs contains about 300 million balloon-like structures called alveoli, which replace the carbon-dioxide in your blood with oxygen. When these structures are filled with air, the lungs become the only organs in the human body that can float. 
  • What do lungs and a tennis court have in common? Their size!  It's true. If the lungs were opened flat, they would be so big that they would cover the size of a tennis court.
  • We breathe out over a cup of water every day. 
  • Lungs aren’t the same size. The left lung is slightly smaller, allowing room for your heart which is on the left side too.
  • The World Record for a person holding their breath is 24minutes and 3 seconds.  (don’t try it at home!)
  • Horses can only breathe through their noses and not through their mouth. 

Send us pictures or videos of what you have done. Ask your parents to help you send them to

Answers:  1) 1=lungs 2 = diaphagm 2) i) Oxygen ii) Carbon Dioxide 3) 1=Inhale 2=Exhale