Question

Why do arteries have thick walls? Why do arteries have elastic walls?

Answer 1

The thicker and more muscular walls of arteries help them to withstand and absorb the pressure waves which begin in the heart and are transmitted by the blood. ... They do not have the need for the strength and elasticity of the arteries, so the walls of the veins are thin and almost floppy.

Answer 2

The right atrium receives deoxygenated blood through coronary sinus and two large veins called Venae Cavae. The inferior vena cava (or caudal vena cava in some animals) travels up alongside the abdominal aorta with blood from the lower part of the body.