Question

Why is the walls of ventricals thicker than the walls of atria

Answer 1

The ventricles of the heart have thicker muscular walls than the atria. This is because blood is pumped out of the heart at greater pressure from these chambers compared to the atria. The left ventricle also has a thicker muscular wall than the right ventricle, as seen in the adjacent image.

Answer 2

ventricals have to pump the oxygenated blood all over the body with great pressure

for this reason ventrical have thick wall