Cartilage matrix is digested during its osteogenesis through

Options

A. Intracellular autophagic activity
B. Extracellular lysosomal activity
C. Intercellular heterophagic activity
D. Both B and C

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks how the cartilage matrix is digested during osteogenesis. Osteogenesis is the process of bone formation, and it involves the transformation of cartilage into bone.

2. **Identifying the Options**: The options provided are:
- A) Intracellular autophagic activity
- B) Extracellular lysosomal activity
- C) Intracellular heterophagic activity
- D) Both B and C

3. **Analyzing the Options**:
- **Option A**: Intracellular autophagic activity refers to the process where cells degrade their own components. While this is important for cellular maintenance, it does not specifically relate to the digestion of cartilage during osteogenesis.
- **Option B**: Extracellular lysosomal activity involves the breakdown of materials outside the cell by lysosomes. This is relevant to the digestion of the cartilage matrix during osteogenesis, as it is the primary mechanism through which the cartilage is broken down to allow for bone formation.
- **Option C**: Intracellular heterophagic activity refers to the process where cells engulf and digest foreign materials. This is not the primary mechanism for cartilage digestion during osteogenesis.
- **Option D**: Since only option B is correct, this option is also incorrect.

4. **Conclusion**: Based on the analysis, the correct answer to the question is **B) Extracellular lysosomal activity**.

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