Atrium -
| The heart has four chambers, two
atria and two ventricles. The right atrium and left atrium collect
the blood that is returning to the heart. The left atrium collects
blood returning to the heart from the lungs; the right atrium collects the
blood returning to the heart from the rest of the body. At the
appropriate moment, the right and left atria contract, ejecting the blood
they have collected into the right and left ventricles,
respectively.
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