Homeschool Science: Model Heart


If your child is learning anatomy this is a great activity to demonstrate how the heart pumps blood through the body. It’s fairly simple to assemble and your child is sure to enjoy demonstrating just how it works. Check it out:

What you need:

  • beaker or jar
  • water
  • red food coloring
  • two bendy straws
  • tape
  • a balloon (preferably red, but it doesn’t really matter)
  • scissors
  • a large pan or your sink (so the “blood” doesn’t get everywhere)

What to do: 

  1. Fill your jar or beaker halfway up with water, and mix red food coloring into the water so that it looks like blood. Cut off the neck of the balloon (set this piece aside) and stretch the opening over the edge of your jar. Pull it down enough so that the top is a flat surface. You can secure this with tape if you need to.
  2. With your scissors, poke two small holes in the top of your balloon. Just make them big enough that the straws can get through without any air escaping around them. If you accidentally make them too big, tape over the excess. Put the straws through the holes with the straight side down and the bendy side sticking out, just like you would in a normal cup.
  3. Use tape to place that cut off neck of the balloon over the end of one of the straws so that it is completely sealed off (blood only pumps one way). Now you’re done! Press on the surface of the balloon to pump “blood” through the “artery” and out.  Make sure the open straw is aimed within the sink or pan so “blood” doesn’t get everywhere!

Enjoy and check out all of the science subjects on SD Accelerate! Don’t forget to sign up for our two month free trial here!