How many ribs are present in human beings

Options

A. 6 pairs
B. 9 pairs
C. 15 pairs
D. 12 pairs.

Answer

To answer the question "How many ribs are present in human beings?" we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of Ribs**:
- Human beings have a total of 12 pairs of ribs. This means there are 24 individual ribs in total.

2. **Classification of Ribs**:
- The ribs can be classified into three categories: true ribs, false ribs, and floating ribs.
- The first seven pairs of ribs (1-7) are known as true ribs because they are directly attached to the sternum via costal cartilage.

3. **Connection to the Vertebral Column**:
- Each rib is connected dorsally (at the back) to the thoracic vertebrae and ventrally (at the front) to the sternum.

4. **Formation of the Rib Cage**:
- The combination of the thoracic vertebrae, sternum, and ribs forms the rib cage, which provides protection to the thoracic organs.

5. **Conclusion**:
- Thus, the correct answer to the question is that there are 12 pairs of ribs in human beings.

### Final Answer:
- **12 pairs of ribs** are present in human beings.

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