What is atrium?
- - 1. One of the two upper chambers of the heart; after birth, in the normal human the right atrium receives blood from the venae cavae and the left atrium receives blood from the pulmonary veins; the blood passes from each atrium to the respective ventricle
- - 2. A shallow depression in the nasal cavity; the anterior extension of the middle meatus, located above the vestibule.
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