Question

Bicuspid and tricuspid valves open to allow

• A. blood from the pulmonary artery and vena cava to flow into the left and right ventricles, respectively
• B. blood from the pulmonary vein and vena cava to flow into left and right ventricles, respectively
• C. blood from the pulmonary vein and vena cava to flow into left and right atrium, respectively
• D. oxygen from the pulmonary vein and vena cava to flow into left and right atrium, respectively

Answer 1

Answer: (B)

During joint diastole, all the four chambers of heart are in a relaxed state. This causes the tricuspid and bicuspid valves to open and blood from the pulmonary veins and vena cava flows into the left and the right ventricle, respectively through the left and right atria. The semilunar valves are closed at this stage.