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, ...The above text is a snippet from Wikipedia: Atrium (heart)
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atrium
Noun
- A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
- A square hall lit by daylight from above, into which rooms open at one or more levels.
- 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.