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.
Who has beat Wilma Rudolph's record for fastest woman in the world?   Wilma Rudolph's automatic timed world record in the 100 meter dash, 11.41 seconds set at the 1960 Olympics in Rome, was bettered by Wyomia Tyus at 11.23 seconds at the 1â¦964 Olympics in Tokyo.