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    Home / Science projects / Science Project: How your heart pumps
    • Science Project: How your heart pumps

      Science Project: How your heart pumps

      Make a Heart Pump Science Project

      Find out how the amazing muscles that make up your heart work to keep your blood pumping every day. Make a pump using a jar, a balloon, and two straws to get an idea of how your heart pumps blood.

      What You Need:

      **Children under 8 can choke or suffocate on uninflated or broken balloons. Use adult supervision and keep uninflated balloons from children. Discard broken balloons at once.


      related product

      Buy the supplies for this project in one convenient kit!

      Make A Heart Pump Science Kit >>



      What You Do:

      1. Fill the jar half full of water.
      2. Cut the neck of the balloon off at the part where it starts to widen into a balloon. Set the neck part aside.
      3. Stretch the balloon over the opening of the jar, pulling it down as tightly as you can. The flatter you can get the surface of the balloon, the better.
      4. Carefully use the tip of a skewer to poke two holes in the surface of the balloon. Make them about an inch apart from each other and near opposite edges of the jar.
      5. Stick the long part of a straw into each hole. The straws should fit securely in the holes so no air can get through around the straws.
      6. Slide the uncut end of the balloon neck onto one of the straws and tape it around the straw.
      7. Set your pump in a large pan or the sink to catch the pumped water. Bend the straws downward. Gently press in the center of the stretched balloon and watch what happens to the water in the jar.

      Learn how your heart pumps blood

      What Happened:

      You made a simple pump that moved water from the jar through the straws and into the pan. The cut end of the balloon worked as a valve to stop the water from going back down the straw. Your heart pumps blood out into your body through your arteries in a similar way.

      Human hearts have four separate chambers inside. This pump shows how one chamber and its valve works. A valve is used to keep blood that has been pumped from one chamber to another from flowing back into the chamber it came from. Try taking the balloon valve off of the straw and pump water again. Did you notice anything different? You likely saw that water still came out of the straw, but without the valve, there was nothing to keep some water from going back down the straw. In order to keep blood moving through your heart and into your body, your heart needs valves to separate its chambers.

      Original project found here.


      More heart science:

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    By: Emily
    Date: Jun 08, 2017

    I found that jutting the balloon neck on the straw did nothing idk how you’re supposed to make it stop water but it didn’t stop water from going back down

    By: Abby
    Date: Apr 12, 2016

    I’m doing the Human Heart for a project at school and this helped sooo much! My whole class loved it! Thank you!!!!! This experiment worked so well and I recommended others to try it!

    By: Azariyah
    Date: Apr 12, 2016

    I am making a how does exercise effect heart rate in a science fair Thank you for the help!
    /\  _ /\

    By: Elizabeth
    Date: Nov 19, 2015

    I’m entering a science fair and I am doing a human heart and how your heart pumps so thank you so much I can’t wait to get started!!!!!  :-)

    Date: Sep 28, 2015

    Nice way to make heart model

    By: shivani
    Date: Jul 15, 2015

    it is very nice and good it help to the student to grew the knowledge and skill and help the week student to learn properly

    By: ali moiz
    Date: Jul 12, 2015

    i love science

    By: danice terencio
    Date: Jun 19, 2015

    Q1. what does the water inside the jar represent
    Q2. how will you compare the heart pump model
    and the human heart
    Q3. how does the heart function as a pump
    Q4. will the heart model be able to function properly
    if the straw is bloked? explain your answer


    By: john mark canaria geromo
    Date: Jun 18, 2015

    this activity is so beautiful :)

    By: Cloud
    Date: Jun 18, 2015

    what does the water inside the jar represent?