Both pulmonary and renal arteries

Options

A. (a) have internal valves
B. (b) contain oxygenated blood
C. (c) thick-wall and narrow lumen
D. (d) deliver carbon dioxide to the organs they supply

Answer

To solve the question regarding the common features of both pulmonary and renal arteries, we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Understanding the Function of the Arteries**:
- The pulmonary artery carries deoxygenated blood from the heart to the lungs for oxygenation.
- The renal artery carries oxygenated blood from the heart to the kidneys for filtration and waste removal.

2. **Analyzing Each Statement**:
- **Statement A**: "Both have internal walls."
- This statement is false. While arteries do have internal walls, the phrasing is misleading as it does not specify any unique feature that is common to both.

- **Statement B**: "Both pulmonary and renal arteries contain oxygenated blood."
- This statement is false. The pulmonary artery carries deoxygenated blood, while the renal artery carries oxygenated blood.

- **Statement C**: "Both have thick walls and narrow lumen."
- This statement is true. Both pulmonary and renal arteries have thick muscular walls and a narrow lumen, which is characteristic of arteries. This structure helps maintain high blood pressure necessary for blood flow.

- **Statement D**: "They deliver carbon dioxide to the organs they supply."
- This statement is false. The pulmonary artery does transport carbon dioxide to the lungs, but the renal artery does not; it supplies oxygenated blood to the kidneys.

3. **Conclusion**:
- After analyzing all the statements, the only true statement that is common to both pulmonary and renal arteries is that they both have thick walls and narrow lumen. Therefore, the correct answer is **C**.

### Final Answer:
**C: Both have thick walls and narrow lumen.**