1. Which blood vessel carries blood from the heart to all parts of the body?   aorta   vena cava   right coronary artery   anterior cardiac vein   Hint Half-n-half Clue   2. The hepatic portal vein carries blood from the stomach and the intestine into the _______.   liver   lungs   heart   kidneys   Half-n-half Clue   3. The walls of capillaries comprise a single layer of squamous epithelium.   True   False   4. Veins have a narrow lumen (the central space through which blood flows).   True   False   5. Valves are present in arteries.   True   False   6. Arteries have thick walls.   True   False   7. If an artery is empty, it collapses.   True   False