There's Something Beating Here Inside My Body And It's Called...

["The heart is a pear shaped, muscular organ in vertebrates, responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods. The term cardiac (as in cardiology) means 'related to the heart' and comes from the Greek 'kardia,' for 'heart.' The heart is composed of cardiac muscle, an involuntary muscle tissue which is found only within this organ."]

[So saith Wikipedia, and I have nothing to add.]

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