Veins use valves to transport blood towards the heart, but capillaries don’t have valves. Capillaries diffuse blood and nutrients between veins and arteries through their thin walls.

The appearance of thick, twisty varicose veins can be a bit scary. It is normal to wonder if the protruding veins are a sign of a potential cardiac concern.How do varicose veins affect the heart an… ...

Because arteries are moving blood being pumped out by the heart, the walls of arteries are thicker and more elastic than those of veins.