1. A portal vein begins in the form of capillaries and ends in the form of capillaries too.   True   False   2. 'Systolic pressure' is the term that indicates the lower limit of blood pressure.   True   False   3. The auricles of the heart have thicker walls than the ventricles.   True   False   4. Blood aids in regulating the body temperature.   True   False   5. Pericardium is the double-walled membranous covering that protects the heart.   True   False   6. The word 'pulse' is related to veins.   True   False   7. The spleen is located behind the stomach.   True   False