1. The left auricle of the heart receives _______ blood from the lungs.   oxygenated   deoxygenated   2. Which fluid fills up the space between all human body cells?   intercellular fluid   extracellular fluid   extercellular fluid   intracellular fluid   Hint Half-n-half Clue   3. The _______ of the heart pumps the blood up to the lungs only.   right auricle   left ventricle   right ventricle   left auricle   Half-n-half Clue   4. The process of circulation of blood in the heart begins with the _______ of the auricles of the heart.   relaxation   contraction   5. With reference to the heartbeat, the word 'systole' refers to a relaxation phase whereas the word 'diastole' refers to a contraction phase.   True   False   6. Plasma is a constituent of blood.   True   False   7. During the atrial systole, the atrial muscles _______.   contract   relax