The Cardiovascular System 12. Circle the term that does not belong in each of the following groupings. 1. Pulmonary trunk Vena cava Right side of heart Left side of heart 2. QRS wave T wave P wave Electrical activity of the ventricles 3. AV valves closed AV valves opened Ventricular systole Semilunar valves open 4. Papillary muscles Aortic semilunar valve Tricuspid valve Chordae tendineae 5. Tricuspid valve Mitral valve Bicuspid valve Left AV valve 6. Ischemia Infarct Scar tissue repair Heart block CARDIOVASCULAR SYSTEM: BLOOD VESSELS