Which of the following is valve less `:-`

Options

A. Arteries
B. Veins
C. Lymphatics
D. Chambers in Heart

Answer

To determine which of the following is valveless among arteries, veins, lymphatics, and chambers of the heart, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding the Heart Chambers**:
- The heart has chambers (atria and ventricles) that are separated by valves known as atrioventricular valves (e.g., bicuspid and tricuspid valves).
- **Conclusion**: The chambers of the heart are not valveless.

2. **Analyzing Veins**:
- Veins carry deoxygenated blood (with the exception of the pulmonary vein).
- Blood in veins flows at lower pressure, which increases the risk of backflow.
- To prevent this backflow, veins have valves.
- **Conclusion**: Veins are not valveless.

3. **Examining Lymphatics**:
- Lymphatic vessels also contain valves to prevent the backflow of lymph fluid.
- **Conclusion**: Lymphatics are not valveless.

4. **Evaluating Arteries**:
- Arteries carry oxygenated blood (except for the pulmonary artery) and operate under high pressure.
- Due to this high pressure, blood flows in one direction, eliminating the need for valves.
- **Conclusion**: Arteries are valveless.

### Final Answer:
The correct answer is **Arteries** as they are the only option that is valveless.

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