How many veins are there in a normal human body?

The number of veins in the human body is estimated to be around 60,000 to 80,000 kilometers (37,000 to 50,000 miles) in total length. This extensive network of veins serves the crucial function of carrying deoxygenated blood back to the heart for recirculation throughout the body. Veins can be found in almost every organ and tissue of the human body, playing a critical role in the circulatory system.