Multiple choice general knowledge What is the length of blood vessels in the average adult body? 120,000km 160,000km 116,000km 140,000km Reveal answer Fill a bubble to check yourself B Correct answer Explanation The total length of blood vessels in an average adult human body is approximately 160,000 km. This includes arteries, veins, and capillaries, with capillaries making up the vast majority of this length.