1. The coronary arteries originate from the base of the aorta.   True   False   2. Which is the largest artery in the human body?   pulmonary artery   aorta   renal artery   hepatic artery   Hint Half-n-half Clue   3. The auricles of the heart have thicker walls than the ventricles.   True   False   4. The aorta originates from the _______ of the heart.   left auricle   right ventricle   right auricle   left ventricle   Half-n-half Clue   5. The spleen is located behind the stomach.   True   False   6. There are four kinds of valves in the heart.   True   False   7. The spleen is a lymphatic organ.   True   False