Out of the 12 pairs of ribs in rib cage of human, how many pair of ribs are true and false, respectively?

Options

A. 7, 3
B. 14, 6
C. 7, 4
D. 14, 4

Answer

To solve the question regarding the number of true and false ribs in the human rib cage, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Total Number of Ribs**:
The human rib cage consists of a total of 12 pairs of ribs, which means there are 24 individual ribs.

2. **Categorize the Ribs**:
The ribs are categorized into three types:
- True Ribs
- False Ribs
- Floating Ribs

3. **Identify True Ribs**:
True ribs are the first 7 pairs (1st to 7th pairs). These ribs are directly attached to the sternum via costal cartilage.

4. **Identify False Ribs**:
False ribs consist of the 8th, 9th, and 10th pairs (3 pairs). These ribs are not directly attached to the sternum but are connected to the 7th rib by cartilage.

5. **Identify Floating Ribs**:
Floating ribs are the 11th and 12th pairs (2 pairs). These ribs do not attach to the sternum at all.

6. **Summarize the Counts**:
- True Ribs: 7 pairs
- False Ribs: 3 pairs
- Floating Ribs: 2 pairs

7. **Answer the Question**:
The question asks for the number of true and false ribs respectively. Therefore, the answer is:
- True Ribs: 7 pairs
- False Ribs: 3 pairs

### Final Answer:
**7 pairs of true ribs and 3 pairs of false ribs.**

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