1. With reference to the heartbeat, the word 'systole' refers to a relaxation phase whereas the word 'diastole' refers to a contraction phase.   True   False   2. During the atrial systole, the openings of the pulmonary vein and the vena cava are _______.   open   closed   3. The left auricle of the heart receives _______ blood from the lungs.   oxygenated   deoxygenated   4. The right auricle of the heart receives oxygenated blood.   True   False   5. When the auricles of the heart contract, the ventricles relax, and vice versa.   True   False   6. Which fluid fills up the space between all human body cells?   intracellular fluid   extracellular fluid   extercellular fluid   intercellular fluid   Hint Half-n-half Clue   7. During the ventricular systole, the semilunar valves are closed.   True   False