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.
The major functions are: Red Cells-Carry Oxygen and Carbon Dioxide from the cells throughout the body White Cells-Defend â¦ the body from bacteria, germs, and toxins Plasma-Carry nutrients throughout the body Platelet-Major part in clotting blood and repairing blood vessel walls.