Which chamber receives oxygenated blood from the lungs through the pulmonary veins?

• A. Right Ventricle
• B. Left Atrium
• C. Pulmonary Artery
• D. Diaphragm

Answer: (B)

Receiving oxygenated blood from the lungs via the pulmonary veins enters the heart at the left atrium. The pulmonary veins carry oxygen-rich blood back from the lungs and drain into this chamber, which then passes the blood to the left ventricle and onward to the body. The right side of the heart handles deoxygenated blood: the right atrium collects it from the body, and the right ventricle sends it to the lungs via the pulmonary artery. The pulmonary artery is a vessel, not a chamber, and the diaphragm is a breathing muscle. So the chamber that receives oxygenated blood from the lungs through the pulmonary veins is the left atrium.