1. Pericardium is the double-walled membranous covering that protects the heart.   True   False   2. Which is the largest artery in the human body?   pulmonary artery   aorta   hepatic artery   renal artery   Hint Half-n-half Clue   3. There are four kinds of valves in the heart.   True   False   4. The coronary arteries originate from the base of the aorta.   True   False   5. A portal vein begins in the form of capillaries and ends in the form of capillaries too.   True   False   6. The aorta originates from the _______ of the heart.   right ventricle   left auricle   left ventricle   right auricle   Half-n-half Clue   7. The pulse rate decreases during strenuous physical work.   True   False