Which one of the following vertebrae organs receives the oxygenated blood only ?

Options

A. Gill
B. Lung
C. Liver
D. Spleen

Answer

To solve the question of which vertebrate organ receives only oxygenated blood, we can follow these steps:

### Step 1: Understand the Question
The question asks for a vertebrate organ that receives only oxygenated blood. This means we need to identify which of the given options does not receive deoxygenated blood at any point.

### Step 2: Analyze the Options
The options provided are:
- A) Gill
- B) Lungs
- C) Liver
- D) Spleen

### Step 3: Evaluate Each Option
1. **Gill**: Gills are responsible for gas exchange in aquatic animals. They receive deoxygenated blood to extract oxygen from water. Therefore, gills do not receive only oxygenated blood.

2. **Lungs**: Lungs are the respiratory organs in terrestrial vertebrates. They receive deoxygenated blood from the heart to oxygenate it. Thus, lungs also do not receive only oxygenated blood.

3. **Liver**: The liver receives blood from the hepatic portal vein, which carries deoxygenated blood from the digestive organs. Hence, the liver does not receive only oxygenated blood.

4. **Spleen**: The spleen is involved in filtering blood and does not have a direct role in gas exchange. It receives blood from the splenic artery, which carries oxygenated blood. The spleen primarily receives oxygenated blood.

### Step 4: Conclusion
Based on the analysis, the only organ that receives only oxygenated blood is the **spleen**. Therefore, the answer to the question is:

**Answer: D) Spleen**

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