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.
Arteries are the vessels that carry blood away from your heart to the different parts of your body. The pulmonary ar â¦ teries take blood to the lungs to pick up oxygen. Veins bring deoxygenated blood back to the heart, and from the lungs after the blood is pumped there.apillaries serve as the transfer vessels. They help transfer the contents of the blood stream to the major organs and tissues that need oxygenation, and draw waste products from the target tissues back into the blood stream.