1. The process of circulation of blood in the heart begins with the _______ of the auricles of the heart.   contraction   relaxation   2. During the atrial systole, the openings of the pulmonary vein and the vena cava are _______.   closed   open   3. In a normal adult, the red blood corpuscles are produced in the liver.   True   False   4. Which fluid fills up the space between all human body cells?   extercellular fluid   extracellular fluid   intracellular fluid   intercellular fluid   Hint Half-n-half Clue   5. The cardiac veins carry blood to the walls of the heart.   True   False   6. The left auricle of the heart receives _______ blood from the lungs.   oxygenated   deoxygenated   7. The _______ of the heart pumps the blood up to the lungs only.   left auricle   left ventricle   right auricle   right ventricle   Half-n-half Clue