What are the downstairs chambers of a heart?

The downstairs chambers of the heart are the right and left ventricles. These muscular chambers are responsible for pumping blood out of the heart: the right ventricle sends deoxygenated blood to the lungs for oxygenation, while the left ventricle pumps oxygenated blood to the rest of the body. Their strong muscular walls are essential for generating the pressure needed to propel blood effectively.