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. The inferior vena cava carries blood from the upper parts of the body to the heart.   True   False   3. The process of circulation of blood in the heart begins with the _______ of the auricles of the heart.   contraction   relaxation   4. Which fluid fills up the space between all human body cells?   extracellular fluid   intercellular fluid   extercellular fluid   intracellular fluid   Hint Half-n-half Clue   5. The cardiac veins carry blood to the walls of the heart.   True   False   6. The right auricle of the heart receives oxygenated blood.   True   False   7. The left auricle of the heart receives _______ blood from the lungs.   oxygenated   deoxygenated