What are viens?

To transport blood with waste product to the various organs of the body that cleans it up.

To transport blood throughout the human body.

Varicose Veins are swollen, distended, enlarged veins which often appear twisted and gnarled. They are most visible on the lower legs, and most common in older people. Besides on the legs, they can...

the largest veins are the superior and inferior vena cava

The renal vein transports blood out of the kidney