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Last updated 4:40 PM on 10/1/26

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Heart chambers

Four chambers: right atrium, left atrium, right ventricle, left ventricle.

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Atria

Two superior chambers that receive blood returning to the heart.

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Ventricles

Two inferior chambers that pump blood into arteries.

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Auricles

External extensions of the atria that enlarge chamber capacity.

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Atrioventricular sulcus

Groove separating the atria from the ventricles.

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Interventricular sulcus

Groove overlying the septum separating the right and left ventricles.

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Coronary arteries

Located in the heart's sulci and supply the myocardium.