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The heart is a hollow muscular organ found in vertebrates and certain invertebrates.

The heart is responsible for pumping blood throughout the circulatory system of an organism via rhythmic contraction and dilation through arteries and veins. The heart may have up to four chambers in vertebrates.

Anatomy of an amiotic egg This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.


Toothed whale echolocation 01 This article is part of Project Animal Anatomy, a All Birds project that aims to write comprehensive articles on each term general related to animals.
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