1. Which fluid fills up the space between all human body cells?   intracellular fluid   extracellular fluid   intercellular fluid   extercellular fluid   Hint Half-n-half Clue   2. During the ventricular systole, the blood enters the ventricles.   True   False   3. The left auricle of the heart receives _______ blood from the lungs.   oxygenated   deoxygenated   4. During the atrial systole, the atrial muscles _______.   relax   contract   5. The _______ of the heart pumps the blood up to the lungs only.   right ventricle   right auricle   left auricle   left ventricle   Half-n-half Clue   6. The process of circulation of blood in the heart begins with the _______ of the auricles of the heart.   relaxation   contraction   7. When the auricles of the heart contract, the ventricles relax, and vice versa.   True   False