connective The outer layer of a blood vessel (artery or vein) is called the tunica externa or tunica adventitia.See http://training.seer.cancer.gov/module_anatomy/unit7_3_ca â¦ rdvasc_blood1_classification.html pericardium is the layer of the blood vessel that is made of tough  connective tissue.onnective The outer layer of a blood vessel (artery or vein) is called the tunica externa or tunica adventitia.
As of June 2000, the fastest running human is Michael Johnson, the American track and field star who on August 1, 1996 set the world record of running 200 meters in 19.32 seconds.
Check out our list of the top ten quickest 100m sprinters in history. Who is the fastest man in the world? Currently the answer is Jamaican sprinter Usain Bolt, heâs also the fastest man in history with a world record time of 9.58 seconds.The fastest woman is history is Florence Griffith-Joyner with a world record time of 10.49.heck out our list of the top ten quickest 100m sprinters in history. Who is the fastest man in the world? Currently the answer is Jamaican sprinter Usain Bolt, heâs also the fastest man in history with a world record time of 9.58 seconds.