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www.heart-music.comJul 16, 2007
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heart is a muscular organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions,
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...en.wikipedia.orgAn online exploration of the
heart from The Franklin Institute Science Museum.
www.fi.eduLearn more about the American
Heart Association's efforts to reduce death caused by cardiovascular disease.
www.americanheart.orgheart image Your
heart is really a muscle. It's located a little to the left of the middle
... The ventricles then squeeze, pumping blood out of the
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...www.healthcentral.comThe
heart is a vital organ that basically serves as a pump. Learn about
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Wikipedia
Heart
From Wikipedia, the free encyclopedia
This article is about the organ. For other uses, see Heart (disambiguation).
The heart and lungs, from an older edition of Gray's Anatomy.
The heart 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 καρδία, kardia, for "heart."
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.
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