Question

Why are the left chambers of the heart thicker than those on the right?

Answer 1

This is because the left ventricle pumps oxygenated blood round the entire body while the right ventricle only pumps blood to the lungs

Answer 2

The ventricles of the heart have thicker muscular walls than the atria. ... The left ventricle also has a thicker muscular wall than the right ventricle, as seen in the adjacent image. This is due to the higher forces needed to pump blood through the systemic circuit (around the body) compared to the pulmonary circuit.