Free surfaces of long bones that form joints, sternal parts of ribs have  

Options

A. articular cartilage and nasal septal cartilage
B. perichondrium and articular cartilage
C. articular cartilage & costal cartilage
D. costal cartilage & collagenous

Answer

To solve the question regarding the free surfaces of long bones that form joints and the sternal parts of ribs, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about the type of cartilage present on the free surfaces of long bones that form joints and the sternal parts of ribs.

2. **Identify Key Terms**: The key terms in the question are "free surfaces," "long bones," "joints," and "sternal parts of ribs."

3. **Define Articular Cartilage**: Articular cartilage is a smooth, white tissue that covers the ends of bones where they meet to form joints. This cartilage allows for smooth movement at the joints.

4. **Define Costal Cartilage**: Costal cartilage is the cartilage that connects the ribs to the sternum (breastbone). It provides elasticity and flexibility to the ribcage.

5. **Evaluate the Options**:
- **Option A**: Articular cartilage and nasal septal cartilage. (Nasal septal cartilage is not relevant here.)
- **Option B**: Pericondrium and articular cartilage. (Pericondrium surrounds cartilage but is not directly involved in joint formation.)
- **Option C**: Articular cartilage and costal cartilage. (Both are relevant to the question.)
- **Option D**: Collagen. (Collagen is a protein but does not specifically answer the question about cartilage.)

6. **Select the Correct Option**: Upon evaluating the options, **Option C** (Articular cartilage and costal cartilage) is the correct answer, as both types of cartilage are relevant to the structures mentioned in the question.

### Final Answer:
The free surfaces of long bones that form joints and the sternal parts of ribs have **articular cartilage and costal cartilage**.

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