the two anterior chambers which receiv blood are (fill ups)
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atrium (AY-tree-uhm): The two upper chambers of the heart are called the atria. They are the chambers that fill with the blood returning to the heart from the body and lungs. The heart has a left atrium and a right atrium.
turn are subdivided into two chambers. The upper chamber is called an atrium (or auricle), and the lower chamber is called a ventricle. The two atria act as receiving chambers for blood entering the heart; the more muscular ventricles pump the blood out of the heart.
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