The atrium was the entrance hall for Roman important buildings. This is different from an ordinary hall from a random building. This is the main difference.
Atria is simply the plural of atrium
Auricle is an anatomical extension of the atrium. So auricle is the part of atrium.
circulatory pressure
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An atrium is a room or entrance hall, rather than a house, which has a glass roof.
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Some valves lie between the atria and some valves lie between the atrium and the ventricle
The atrium was so beautiful after it was decorated for the wedding. This sentence is great since atrium describes an entrance hall that has no roof.
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