1. The left auricle of the heart receives _______ blood from the lungs.   oxygenated   deoxygenated   2. Plasma is a constituent of blood.   True   False   3. The _______ of the heart pumps the blood up to the lungs only.   right ventricle   left ventricle   left auricle   right auricle   Hint 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. During the atrial systole, the atrial muscles _______.   relax   contract   6. When the auricles of the heart contract, the ventricles relax, and vice versa.   True   False   7. During the ventricular systole, the blood enters the ventricles.   True   False