1. The _______ of the heart pumps the blood up to the lungs only.   right ventricle   right auricle   left auricle   left ventricle   Hint Half-n-half Clue   2. The process of circulation of blood in the heart begins with the _______ of the auricles of the heart.   contraction   relaxation   3. When the auricles of the heart contract, the ventricles relax, and vice versa.   True   False   4. During the atrial systole, the atrial muscles _______.   relax   contract   5. The cardiac veins carry blood to the walls of the heart.   True   False   6. With reference to the heartbeat, the word 'systole' refers to a relaxation phase whereas the word 'diastole' refers to a contraction phase.   True   False   7. Plasma is a constituent of blood.   True   False