Which two structures together form the primary muscle mass of the heart?

Question

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The ventricles are large, thick-walled chambers that pump blood to the lungs and throughout the body. The right and left ventricles together form the primary muscle mass of the heart. The left ventricle pumps blood through the aortic valve into the aorta, which provides blood to the rest of the body. The right and left atrium pumps blood through the tricuspid and mitral valves to the ventricles. The pulmonary vein pumps oxygenated blood from the lungs to the left atria.

Which Two Structures Together Form the Primary Muscle Mass of the Heart