Why are the right and left lungs slightly different in shape?

Explanation

### Step-by-Step Solution:

1. **Understanding the Structure of Lungs**: The human respiratory system consists of two lungs: the right lung and the left lung. Each lung is responsible for gas exchange, but they differ in shape and size.

2. **Lobes of the Lungs**: The right lung is divided into three lobes: the upper lobe, middle lobe, and lower lobe. The left lung, on the other hand, has only two lobes: the upper lobe and the lower lobe.

3. **Reason for Size Difference**: The difference in the number of lobes is primarily due to the need to accommodate other organs in the thoracic cavity. The right lung is shorter than the left lung because it sits above the liver, which is located on the right side of the body. The presence of the liver necessitates a shorter lung on that side.

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