Which chamber of the heart has the thickest muscular wall?

The left ventricle has the thickest muscular wall of all the heart's chambers, and this is due to its critical role in the circulatory system. The left ventricle is responsible for pumping oxygenated blood to the entire body through the aorta, requiring it to generate a significant amount of pressure. This high demand for pressure is why the left ventricular wall is much thicker than those of the other chambers, allowing it to contract forcefully and efficiently.

In contrast, the right ventricle only needs to pump blood to the lungs, which are located relatively close and require less pressure. Thus, its muscular wall is not as thick as that of the left ventricle. The atria, including both the right and left atria, have even thinner walls than the ventricles because they primarily serve as receiving chambers for blood rather than pumping it out to the body or lungs.