Question

why do verticles have thicker muscular walls than Atria...

Answer 1

Ventricles have thick walls bcoz they have to distribute blood into or throughout the whole body. So to prevent it from mixing it has thick walls.

Answer 2

Hii..
Walls of ventricles are thicker than auricles as they have to pump blood with huge force and pressure into the vein and artery..
Left ventricle is more thick than right ventricle.. morphologically..as it pumps oxygenated blood which is to be transported to body parts..

hope this helps!!