what is atrium? give its effect on coelom
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In architecture, an atrium (plural: atria or atriums)is a large open air or skylight covered space surrounded by a building.Atria were a common feature in Ancient Roman dwellings, providing light and ventilation to the interior. Modern atria, as developed in the late 19th and 20th centuries, are often several stories high and having a glazed roof or large windows, and often located immediately beyond the main entrance doors (in the lobby).
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1.each of the two upper cavities of the heart
from which blood is passed to the ventricles. The right atrium receives deoxygenated blood from the veins of the body, the left atrium oxygenated blood from the pulmonary vein.
The body cavity is formed by enterocoely. Enterocoely is the formation of the body cavity by outpocketings of the primitive gut that break off and form the coelom.
Cleavage is indeterminate.This means that the fate of each individual cell is not determined when it is formed and each cell can form one of many cell types.
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