1. The pulse rate decreases during strenuous physical work.   True   False   2. The spleen is located behind the stomach.   True   False   3. Pericardium is the double-walled membranous covering that protects the heart.   True   False   4. There are four kinds of valves in the heart.   True   False   5. Which is the largest artery in the human body?   hepatic artery   pulmonary artery   aorta   renal artery   Hint Half-n-half Clue   6. The coronary arteries originate from the base of the aorta.   True   False   7. The word 'pulse' is related to veins.   True   False