. The ……………are the chambers at the top with comparatively thinner walls.
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The upper chambers on each side of the septum are auricles, the lower chambers are called ventricles. Auricles have thin walls and act as receiving rooms for the blood while the ventricles below act as pumps, moving the blood away from the heart.
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Chambers of the Heart.
The upper two, called atria (or, sometimes, auricles), are thin-walled reservoirs that readily distend to collect blood that pours in from the veins between beats.
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