29. The walls of ventricles are much thicker than atria. Explain.
The structure of heart of fishes, reptiles, birds and mammals show many structures of evolutionary significance. Thicker walis of ventricles is one of them. Ventricles have thick walls because these are mainly involved in pumping the blood to the body parts with certain pressure.
The walls of the left ventricle is about 3 times thicker from the right ventricle, while the atria acts as a collecting chambers for the blood which is starting to the heart thus have thin walled force the blood into the ventricles that lies just below there thus atria have thin walls.
