What is an atrium?
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American Heart Association answered:An atrium is either of the heart’s two upper chambers where blood collects before being passed to the ventricles (the heart’s lower chambers).
An atrium is either of the heart’s two upper chambers where blood collects before being passed to the ventricles (the heart’s lower chambers). More -
On each side of the heart there is an upper, low-pressure chamber that collects blood from the veins and delivers it to the ventricles, the main pumping chambers of the heart. These upper chambers are called the atria (plural) or atrium (singular).On each side of the heart there is an upper, low-pressure chamber that collects blood from the veins and delivers it to the ventricles, the main pumping chambers of the heart. These upper chambers are called the atria (plural) or atrium (singular). More
