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.
1 Blood is carried in a closed system of vessels that begins and ends at the heart. 2  The three major types of vessels are arteries, capillaries, and veins. 3  Arteries carry blood away from the heart, veins carry blood toward the heart. 4  Capillaries contact tissue cells and directly serve cellular needs. At the arterial end of a bed, __________ forces dominate (fluids flow 2  ___). At the venous end of a bed, _______ forces dominate (fluids flow 3  ___). More fluids enter the tissue beds than return blood, and the excess fluid is returned to the blood via the _________ _______.