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Heart - Wikipedia, the free encyclopedia
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Heart
From Wikipedia, the free encyclopedia
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Cardiac)
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This article is about the organ in various animals. For the human heart, see
Human heart. For other uses, see
Heart (disambiguation).
"Cardiac" redirects here. For the cardboard computer, see
CARDboard Illustrative Aid to Computation.
This article needs additional
citations for
verification.
Please help
improve this article by adding
reliable references. Unsourced material may be
challenged and
removed. (July 2009)
The
human heart
Normal heart sounds
Normal heart sounds as heard with a
stethoscope
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media help.
The heart is a
myogenic muscular organ found in all
animals with a
circulatory system (including all
vertebrates), that is responsible for pumping
blood throughout the
blood vessels by repeated, rhythmic contractions. The term cardiac (as in
cardiology) means "related to the heart" and comes from the
Greek ??????, kardia, for "heart".
The vertebrate heart is composed of
cardiac muscle, which is an involuntary striated muscle tissue found only in this organ, and
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