Q. Concerning the thickness of their walls how different are the heart chambers?
The ventricle walls are thicker than the atrium walls since ventricles are structures responsible for the pumping of the blood to the tissues or lungs. Their muscle fibers develop more and the muscular work of the ventricles is harder.
The left ventricle is more muscular than the right ventricle because pumping blood to the lungs and the right ventricle task is easier needs less pressure than pumping blood to the other tissues of the body the left ventricle task.