slug Created with Sketch. Science Questions

How does the heart pump blood?

The heart pumps blood by contracting (squeezing), the way you could squirt water from a water balloon. Over and over, the heart relaxes to let blood flow into its hollow chambers, then squeezes to push the blood out to the body. This action keeps blood moving to carry oxygen and other nutrients throughout the body and to haul away waste.

Art by: Andy J. Miller

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