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The two upper chambers in your heart are called the atria. One on its own is an atrium. This comes from the Latin word for an open entrance area in a house, because the atria are where the blood enters the heart after returning from either the body or the lungs.

The right atrium receives blood from the body, and pumps it through the tricuspid valve into the right ventricle. The left atrium receives blood from the lungs via the pulmonary veins, and pumps it through the bicuspid valve into the left atrium.

The atria have thinner walls than the ventricles, since they have to pump the blood a shorter distance than the ventricles.

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8y ago

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