In which of the following points pulmonary artery is different form pulmonary vein ?

Options

A. its lumen is broad
B. its wall is thick
C. it has valves
D. its does not possess endothelium

Answer

To solve the question regarding the differences between the pulmonary artery and pulmonary vein, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Function of Pulmonary Arteries and Veins**:
- **Pulmonary Arteries**: These vessels carry deoxygenated blood from the heart (specifically from the right ventricle) to the lungs for oxygenation.
- **Pulmonary Veins**: These vessels carry oxygenated blood from the lungs back to the heart (specifically to the left atrium).

2. **Identifying the Type of Blood Carried**:
- **Pulmonary Arteries**: Carry deoxygenated blood.
- **Pulmonary Veins**: Carry oxygenated blood.

3. **Examining the Structure of the Vessels**:
- **Pulmonary Arteries**: Have thick walls to withstand the high pressure of blood being pumped from the heart.
- **Pulmonary Veins**: Have thinner walls as they carry blood at lower pressure returning to the heart.

4. **Summarizing the Key Differences**:
- **Direction of Blood Flow**: Arteries carry blood away from the heart; veins carry blood towards the heart.
- **Type of Blood**: Arteries (including pulmonary arteries) carry deoxygenated blood; veins (including pulmonary veins) carry oxygenated blood.
- **Wall Thickness**: Pulmonary arteries have thick walls; pulmonary veins have thinner walls.

5. **Conclusion**:
- The pulmonary artery is different from the pulmonary vein primarily in that it carries deoxygenated blood and has thicker walls compared to the pulmonary vein, which carries oxygenated blood and has thinner walls.

### Final Answer:
The pulmonary artery is different from the pulmonary vein in that it carries deoxygenated blood and has thick walls.

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