Left ventricle of human heart has thickest wall. Why?

Explanation

### Step-by-Step Solution:

1. **Understanding the Structure of the Heart**: The human heart consists of four chambers: two atria (upper chambers) and two ventricles (lower chambers). The right ventricle and left ventricle are responsible for pumping blood to different parts of the body.

2. **Function of the Left Ventricle**: The left ventricle's primary function is to pump oxygenated blood from the lungs to the entire body. This requires the left ventricle to generate a significant amount of pressure.

3. **Pressure Requirements**: Since the left ventricle needs to pump blood throughout the body, it must overcome the resistance of the systemic circulation. This requires a higher pressure compared to the right ventricle, which only pumps blood to the lungs.

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