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 World's Fastest Man Meets the World's Slowest Woman. In Beijing the focus has moved from the pool to the track, where Usain Bolt breezed through the 100-meter dash so easily he looked like an Olympian god running against mortals. No doubt he's now the world's fastest human. Another Olympian who held that title was Bullet Bob Hayes, who later played for the Dallas Cowboys. He was crowned world's fastest human at the 1964 Olympics in Tokyo where he won gold medals in the 100-meter dash and as anchor of the 400-meter relay. Like Bolt, Hayes blazed through the dash leaving his competitors in the dust.