For orthopedic surgeons, there is not. It is a rigorous examination that covers the medical and musculoskeletal aspects of sports medicine. The two organizations that certify physicians are the American Board of Medical Specialties (ABMS), and the American Osteopathic Association (AOA) Bureau of Osteopathic Specialists.
An artery usually carries pure, filtered and clean blood away from the heart, to all the parts of the body with an exception of the pulmonary artery and the umbilical cord. As the arteries move away from the heart, they divide into smaller vessels. These thinner arteries are called arterioles.
1 Arteries carry blood away from the heart. 2  They divide again and again, and eventually form very tiny vessels called capillaries. 3  The capillaries gradually join up with one another to form large vessels called veins. 4  Veins carry blood towards the heart.lan of the main blood vessels in the human body. The comparison of blood vessels structure and functions. The transfer of materials between capillaries and tissue fluid. As blood enters capillaries from arterioles (small arteries), it slows down.