1. When the auricles of the heart contract, the ventricles relax, and vice versa.   True   False   2. The cardiac veins carry blood to the walls of the heart.   True   False   3. During the ventricular systole, the semilunar valves are closed.   True   False   4. Which fluid fills up the space between all human body cells?   intercellular fluid   extracellular fluid   extercellular fluid   intracellular fluid   Hint Half-n-half Clue   5. The right auricle of the heart receives oxygenated blood.   True   False   6. During the ventricular systole, the blood enters the ventricles.   True   False   7. The process of circulation of blood in the heart begins with the _______ of the auricles of the heart.   relaxation   contraction