Which has the thickest walls `:-`

Options

A. Left auricle
B. Left ventricle
C. Right auricle
D. Right ventricle

Answer

To determine which part of the heart has the thickest walls among the left auricle, left ventricle, right auricle, and right ventricle, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Heart Anatomy**:
- The heart consists of four chambers: two atria (auricles) and two ventricles. The right atrium and right ventricle are responsible for receiving deoxygenated blood from the body and pumping it to the lungs, while the left atrium and left ventricle handle oxygenated blood from the lungs and pump it to the rest of the body.

2. **Function of Each Chamber**:
- The **right atrium** and **right ventricle** deal with lower pressure as they pump blood to the lungs, which are nearby.
- The **left atrium** receives blood from the lungs, and the **left ventricle** pumps blood to the entire body, which requires more force.

3. **Pressure Requirements**:
- The left ventricle must generate a higher pressure to push blood through the aorta and into systemic circulation. This requires a stronger muscular wall.

4. **Comparing Wall Thickness**:
- The walls of the left ventricle are significantly thicker than those of the right ventricle, left atrium, and right atrium. This is because the left ventricle needs to withstand and generate the high pressure necessary for systemic circulation.

5. **Conclusion**:
- Therefore, the chamber with the thickest walls is the **left ventricle**.

### Final Answer:
The left ventricle has the thickest walls.

---