Articles > Quizzes & Surveys > Semilunar valve definition – quiz Semilunar valve definition – quiz Quiz Choose the best answer. 1. Semilunar valves are valves located in the ________. lungs kidney heart 2. The primary function of the semilunar valves To prevent blood from returning to the ventricles To prevent blood from returning to the atria To prevent blood from flowing 3. Protects the point of attachment between the aorta and the left ventricle Atriventricular valve Aortic semilunar valve Pulmonary semilunar valve 4. The valve located between the pulmonary artery and the right ventricle Atriventricular valve Aortic semilunar valve Pulmonary semilunar valve 5. Semilunar valve disfunction resulting in the flowing of the blood in the wrong direction Regurgitation Pulmonary atresia Stenosis Send Your Results (Optional) Your Name To Email Time is Up!