FACTOID # 51: Russia won the first World Air Games, held in Turkey in 1997. Events included hang-gliding, sky-surfing, and ballooning.
 
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Encyclopedia > Atrium
This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.

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Atrium (anatomy) - Wikipedia, the free encyclopedia (216 words)
In anatomy, the atrium (plural: atria) is the blood collection chamber of a heart.
Their circulatory systems are divided into two types: a three-chambered heart, with two atria and one ventricle, or a four-chambered heart, with two atria and two ventricles.
The atrium's function in the circulatory system includes receiving blood as it returns to the heart to complete a circulating cycle, whereas the ventricle's function is to pump blood out of the heart to start a new cycle.
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