1. The auricles of the heart have thicker walls than the ventricles.   True   False   2. Blood aids in regulating the body temperature.   True   False   3. Which of the following is not a function of the spleen?   Spleen produces red blood corpuscles.   Spleen produces blood platelets.   Spleen produces lymphocytes.   Spleen stores blood.   Hint Half-n-half Clue   4. The spleen is a lymphatic organ.   True   False   5. The aorta originates from the _______ of the heart.   left ventricle   right ventricle   right auricle   left auricle   Half-n-half Clue   6. There are four kinds of valves in the heart.   True   False   7. Pericardium is the double-walled membranous covering that protects the heart.   True   False