Heart, Structure, Function, Diagram, Anatomy, & Facts

Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump that is the center of the circulatory system in humans, other mammals, and birds. Learn more about the heart in this article.

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Heart, Structure, Function, Diagram, Anatomy, & Facts

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