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.
Usain Bolt. Born, August 21, 1986 in Sherwood Content, a small town in Trelawny, Jamaica, Usain is still living in and competes for his country, Jamaica. THE FASTEST MAN IN THE WORLD. Usain Bolt went to the 2008 Summer Olympics in Beijing and won three gold medals.