1. The auricles of the heart have thicker walls than the ventricles.   True   False   2. A portal vein begins in the form of capillaries and ends in the form of capillaries too.   True   False   3. 'Systolic pressure' is the term that indicates the lower limit of blood pressure.   True   False   4. The pulse rate decreases during strenuous physical work.   True   False   5. The aorta originates from the _______ of the heart.   left auricle   right ventricle   left ventricle   right auricle   Hint Half-n-half Clue   6. Which is the largest artery in the human body?   aorta   renal artery   hepatic artery   pulmonary artery   Half-n-half Clue   7. Blood aids in regulating the body temperature.   True   False