1. Which blood vessel carries blood from the lungs to the heart?   pulmonary artery   hepatic artery   pulmonary vein   hepatic vein   Hint Half-n-half Clue   2. If an artery is empty, it collapses.   True   False   3. Veins have a narrow lumen (the central space through which blood flows).   True   False   4. Which blood vessel transports blood from the aorta into the liver?   renal artery   hepatic artery   hepatic vein   renal vein   Half-n-half Clue   5. Capillaries have muscular walls.   True   False   6. Veins are normally located just below the skin.   True   False   7. The hepatic portal vein carries blood from the stomach and the intestine into the _______.   lungs   heart   liver   kidneys   Half-n-half Clue