A B-double or consists of a prime mover towing two semi-trailers, where the first semi-trailer is connected to the prime mover by a fifth wheel coupling (aka 'converter dolly') and the second semi-trailer is connected to the first semi-trailer by a fifth wheel coupling.
1 Arteries. 2  Arteries are elastic vessels that transport blood away from the heart. 3  Pulmonary arteries carry blood from the heart to the lungs where oxygen is picked up by red blood cells. 4  Systemic arteries deliver blood to the rest of the body. 5  Veins. 6  Veins are elastic vessels that transport blood to the heart.
  Blood vessels could be divided into three types based on their basic functions: arteries, capillaries, and veins.   Arteries (and their smaller branches known as arte â¦ rioles) are responsible for carrying blood from the heart out to the tissues.he parts of the blood vessels are veins,arteries and capillaries arteries-are blood vessels that carry blood away from the heart. veins-carry blood back to the heart ca â¦ pillaries-are the tiny blood vessels that connects the arteries to the veins. + 34 others found this useful.