Biografie van Heart
<b>heart</b> is a muscular organ in all 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." <br />
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The heart of a vertebrate is composed of cardiac muscle, an involuntary muscle tissue which is found only within this organ. The average human heart beating at 72 BPM, will beat approximately 2.5 billion times during a lifetime spanning 66 years. <br />
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