ATRIUM

Atrium

In anatomy, the atrium is a portion of the blood collection chamber of the heart. It is also sometimes called the auricle, although in the technical sense, the auricle is a separate part of the main atrium known as the atrial appendages. The atrium is a chamber in which blood enters the heart, as opposed to the ventricle, where it is pushed out of the organ. It has a thin-walled structure that allows blood to return to the heart. There is at least one atrium in animals with a closed circulatory system. In fish, the circulatory system is very simple: a two-chambered heart including one atrium and one ventricle. In other vertebrate groups, ...

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atrium

Noun

  1. A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
  2. A square hall lit by daylight from above, into which rooms open at one or more levels.
  3. Any enclosed sexine and nexine layers, widening toward the interior of the grain.


The above text is a snippet from Wiktionary: atrium
and as such is available under the Creative Commons Attribution/Share-Alike License.

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