Skip to main content

Novel Coronavirus — June 22, 2022 Update: Explore Scouts Canada’s actions as we continue to follow the direction of government and health agencies in maintaining public health. View recommendations and stay informed here. Learn more about Scouts Canada's new vaccination mandate.

Create a Model Heart

Our heart is something that works all day every day, and we often don’t even think about it. Learn the mechanics behind how a heart works by creating your own model heart in this activity.

Back to Activity Finder


  • What materials will you need for this activity?
  • Will you do this activity on your own or in pairs?
  • What do you already know about how your heart works?


  • Gather all your materials
  • Take 2 bottle caps and put a straw sized hole and small hole in one, and 2 straw sized holes in the other
  • Add food colouring to the water (optional), then fill the first 2 bottles 80% of the way full
  • Take 2 bendy straws and join them at the top and secure with tape. Repeat for the other 2 straws
  • Put the caps on the 2 bottles, and then put the straws through the holes into the bottle to connect all 3. The 3rd bottle does not need a cap
  • Use playdough on the top of the middle bottle (the one with 2 straw sized holes to make it air tight
  • Pinch  the first straw and squeeze the middle bottle and watch the “blood” flow


  • What surprised you about this adventure?
  • What was the most challenging part of this adventure? What will you do differently next time?
  • How is the model heart like your heart? How is it different?


  • 4 bendy straws
  • Tape
  • Playdough
  • Red food colouring (optional)
  • 3 bottles with caps
  • 3 cups of water

Keep it Simple

  • Learn about what gets your heart pumping. Count your heart rate (how many times your heart beats in a minute) while sitting still. Then, play a high energy game like tag or capture the flag. Count your heart rate right at the end of the game. Did it change?

Take it Further

  • Learn more about how your body works as you make a model lung