Question

Left atrium receives blood from

• A. Pulmonary artery
• B. Pulmonary vein
• C. Vanacava
• D. Left ventricle

Hint:

Remember the classic exception: Unlike systemic veins which carry deoxygenated blood, the pulmonary veins are the only veins in the adult body that carry oxygen-rich blood.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The mammalian heart has a four-chambered structure designed to keep oxygenated and deoxygenated blood streams completely separate.

Step 3: Detailed Explanation:
Let us trace the path of blood flow through the heart chambers:
1. Deoxygenated blood from the body tissues returns to the right atrium via the vena cava.
2. Blood passes from the right atrium into the right ventricle, which pumps it into the pulmonary artery toward the lungs for oxygenation.
3. Newly oxygenated blood from the lungs returns to the left atrium via the pulmonary veins.
4. From the left atrium, blood moves to the left ventricle, which pumps it into the aorta to supply the systemic circulation.
Thus, the left atrium directly receives oxygenated blood from the pulmonary veins.

Step 4: Final Answer
The left atrium receives oxygenated blood via the pulmonary veins.