Left atrium receives oxygenated blood through

Options

A. coronary artery
B. aorta
C. pulmonary artery
D. pulmonary vein

Explanation

To answer the question "Left atrium receives oxygenated blood through," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Heart's Structure**: The human heart consists of four chambers: the right atrium, right ventricle, left atrium, and left ventricle. The right side of the heart deals with deoxygenated blood, while the left side handles oxygenated blood.

2. **Blood Flow from the Body**: Deoxygenated blood from the body returns to the heart via two large veins: the superior vena cava and the inferior vena cava, which empty into the right atrium.

3. **Pulmonary Circulation**: From the right atrium, the deoxygenated blood moves into the right ventricle, which then pumps it to the lungs through the pulmonary artery. In the lungs, the blood gets oxygenated.

4. **Returning Oxygenated Blood**: After the blood is oxygenated in the lungs, it needs to return to the heart. This oxygenated blood is carried back to the heart through the pulmonary veins.

5. **Entry into the Left Atrium**: The pulmonary veins deliver the oxygenated blood directly into the left atrium of the heart.

6. **Final Pathway**: From the left atrium, the oxygenated blood moves into the left ventricle and is then pumped out to the body through the aorta.

### Conclusion:
The left atrium receives oxygenated blood through the **pulmonary veins**.