1. Pericardium is the double-walled membranous covering that protects the heart.   True   False   2. Blood pressure is exerted by the blood flowing through the veins on the walls of the veins.   True   False   3. The coronary arteries originate from the base of the aorta.   True   False   4. The spleen is a lymphatic organ.   True   False   5. The pulse rate decreases during strenuous physical work.   True   False   6. The spleen is located behind the stomach.   True   False   7. Blood aids in regulating the body temperature.   True   False