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.
Prince Harry beats world's fastest man Usain Bolt in race. Prince Harry has discovered a sure-fire way for Team GB to beat the worldâs fastest man, Usain Bolt: out-and-out cheating. When the Prince challenged Bolt to a race over 30 metres in Kingston, Jamaica, he waited until the 100m record-holderâs back was turned, then dashed off down the track.