1. The auricles of the heart have thicker walls than the ventricles.   True   False   2. Which of the following is not a function of the spleen?   Spleen produces lymphocytes.   Spleen stores blood.   Spleen produces red blood corpuscles.   Spleen produces blood platelets.   Hint Half-n-half Clue   3. There are four kinds of valves in the heart.   True   False   4. Which is the largest artery in the human body?   renal artery   hepatic artery   aorta   pulmonary artery   Half-n-half Clue   5. Pericardium is the double-walled membranous covering that protects the heart.   True   False   6. The pulse rate decreases during strenuous physical work.   True   False   7. Blood pressure is exerted by the blood flowing through the veins on the walls of the veins.   True   False