In what way pulmonary vein is different from other veins ?

Explanation

### Step-by-Step Solution:

1. **Understanding Blood Vessels**:
- In the human body, there are two main types of blood vessels: arteries and veins.
- Arteries carry blood away from the heart, while veins carry blood back to the heart.

2. **Function of Arteries**:
- Most arteries carry oxygenated blood, which means the blood is rich in oxygen and low in carbon dioxide.
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