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