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.

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 deoxygentated 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.