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Heart -- Contraction

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View Resource What Is the Heart?

Figuring out how the heart functions in a metaphorical sense can be an unending and highly metaphysical process (just ask John Donne), so it's nice to find a place online where visitors can learn how the heart functions in a literal sense. This website was created by the National Heart Lung and Blood Institute, and begins by answering the basic question: "What is the Heart?" After reading this...

https://www.nhlbi.nih.gov/health/health-topics/topics/hhw/