Atrium

Key Stage 4

A diagram showing the 4 chambers of the heart with the atria at the top.

The atria are chambers in the heart where blood enters through veins.

Singular Noun: Atrium

Plural Noun: Atria

The atria are separated from the ventricles by heart valves.

The heart has two atria. A right atrium and a left atrium

The right atrium receives deoxygenated blood from the body through a vein called the Vena Cava and pumps it into the right ventricle.

The left atrium receives oxygenated blood from the lungs through a vein called the Pulmonary Vein and pumps it into the left ventricle.