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The Heart diagram/printable from Children's Heart Institute

Cute video (too bad it is just a preview) but does tell about the atria and ventricles in a cute way.

Learning about the heart

Learn about the Heart | ScienceWithMe!

A model of the parts of our blood using Cheerios, colored water, salt & spikey balls (or pom poms would work) #science #homeschool

My Montessori Journey: Montessori--Science