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.
The current fastest man in the World (World record holder of the 100 m sprint race) is Jamaican sprinter Usain Bolt. Jamaican set a new men's 100m record of 9.58 seconds at the World Championships in Berlin, August, 2009.Bolt also holds the World record in 200m (19.30s) and 4 x 100m Relay (37.10s).What makes Usain Bolt the fastest sprinter in the world? Bolt has an estimated 80% of fast-twitch muscle fibres, ideal for sprinting.amaican set a new men's 100m record of 9.58 seconds at the World Championships in Berlin, August, 2009. Bolt also holds the World record in 200m (19.30s) and 4 x 100m Relay (37.10s). What makes Usain Bolt the fastest sprinter in the world? Bolt has an estimated 80% of fast-twitch muscle fibres, ideal for sprinting.