What accounts for the difference in the thickness of heart chambers?

The thickness of heart chambers varies due to their specific functions and the pressure they must generate to pump blood effectively. The left ventricle has the thickest walls because it needs to generate high pressure to pump oxygenated blood throughout the body. In contrast, the right ventricle has thinner walls as it only needs to pump blood to the lungs at lower pressure. The atria have the thinnest walls since they primarily serve as collecting chambers for blood.