Which organ received only oxygenated blood?

Options

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

Answer

To determine which organ receives only oxygenated blood, we can analyze each of the given options: gills, spleen, lungs, and liver.

### Step-by-Step Solution:

1. **Evaluate the Gills**:
- Gills are not present in the human body; they are found in aquatic organisms for respiration. Therefore, this option can be ruled out.
- **Hint**: Remember that gills are respiratory organs for fish, not humans.

2. **Evaluate the Liver**:
- The liver receives blood through the hepatic artery (which carries oxygenated blood) and the hepatic vein (which carries deoxygenated blood). Thus, it does not receive only oxygenated blood.
- **Hint**: Consider the blood supply to the liver and the role of the hepatic portal system.

3. **Evaluate the Lungs**:
- The lungs are responsible for gas exchange. They receive both deoxygenated blood (from the pulmonary arteries) and oxygenated blood (from the pulmonary veins). Therefore, they do not receive only oxygenated blood.
- **Hint**: Think about the function of the lungs in the circulatory system and gas exchange.

4. **Evaluate the Spleen**:
- The spleen is the only organ that exclusively receives oxygenated blood through the splenic artery. It does not receive deoxygenated blood.
- **Hint**: Recall the primary functions of the spleen, including its role in filtering blood and its vascular supply.

### Conclusion:
The organ that receives only oxygenated blood is the **spleen**.