Question

Which labelled parts of the heart pump deoxygenated blood to lungs?

• A. 1, 2 and 6
• B. 1, 2 and 7
• C. 2, 4 and 6
• D. 3, 4 and 5
• E. 3, 4 and 8

Answer 1

The correct option is A 1, 2 and 6

Deoxygenated blood enters the right atrium through the superior vena cava and the inferior vena cava. From the right atrium, the deoxygenated blood drains into the right ventricle through the right atrioventricular (AV) valve. When the ventricles contract, the AV valve closes off the opening between the ventricle and the atrium so that blood does not flow back up into the atrium. As the right ventricle contracts, it forces the deoxygenated blood through the pulmonary semilunar valve and into the pulmonary artery. The semilunar valve keeps blood from flowing back into the right ventricle once it is in the pulmonary artery. The pulmonary artery carries the blood that is very low in oxygen to the lungs, where it becomes oxygenated.