1. The cardiac veins carry blood to the walls of the heart.   True   False   2. The process of circulation of blood in the heart begins with the _______ of the auricles of the heart.   relaxation   contraction   3. The left auricle of the heart receives _______ blood from the lungs.   deoxygenated   oxygenated   4. With reference to the heartbeat, the word 'systole' refers to a relaxation phase whereas the word 'diastole' refers to a contraction phase.   True   False   5. During the ventricular systole, the semilunar valves are closed.   True   False   6. The inferior vena cava carries blood from the upper parts of the body to the heart.   True   False   7. Plasma is a constituent of blood.   True   False