The Four Chambers · Heart
Atria receive blood; ventricles pump it out.
Your heart splits the work: the two rooms on top — the atria — receive blood, and the two below — the ventricles — pump it out.
The two atria are the upper chambers — gentle receiving rooms that top up the chambers below. The two ventricles are the lower chambers — the muscular pumps that send blood to the lungs and the body.
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