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Atrium

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Heart Anatomy - Left Atrium - 3D Anatomy Tutorial

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Right Atrium - Location, Anatomy & Function - Human Anatomy | Kenhub

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Left Atrium Heart Chamber Anatomy - Human Anatomy | Kenhub

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Blood Flow through the Heart in 2 MINUTES

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Internal anatomy of right atrium in an arrested heart

The atrium is the upper chamber in which blood enters the heart. There are two atria in the human heart, which receive blood – the left atrium from the lungs, and the right atrium from the venous circulation. The atria receive blood, and when the heart muscle contracts, pump blood to the ventricles. All animals with a closed circulatory system include at least one atrium / auricle.
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