The left ventricle wall is thicker than the right because it pumps blood around the body while the right pumps blood to the lungs, located close to the heart.
Which Ventricle Has Thicker Walls. Left venricle is more thicker than the right ventricle. The left ventricle also has a thicker muscular wall than the right ventricle, as seen in the adjacent image.
Ventricle (heart) - Wikipedia from upload.wikimedia.org
Because both auricles receive blood from vena cava and pulmonary veins. The left ventricle receives only oxygenated blood from the left atrium through the mitral valve. From right auricle blood enters right ventricle.
These help in carrying blood away from the heart.
The function of atrioventricular valves is to separate the atria from the ventricles and allow blood to flow from the atria to the ventricles in a one direction. It is the muscular middle layer known as due to the force needed to pump blood to the body, ventricles have thicker walls than do atria. The arteries dilate and contract simultaneously with the action of the heart. The order of thickness of the heart wall from thin to thick is auricles, right ventricle and left ventricle.