Epiphysis & Diaphysis of bone is :-

Options

A. End and shaft of long bone respectively
B. Shaft & end of long bone respectively
C. Head & neck of long bone
D. Spongy bone only

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- **Epiphysis:** The epiphysis refers to the end part of a long bone. It is typically rounded and is involved in the formation of joints with adjacent bones.
- **Diaphysis:** The diaphysis is the shaft or central part of a long bone. It is the long, tubular section that connects the two ends of the bone.

2. **Composition of Epiphysis and Diaphysis:**
- The epiphysis is primarily made up of spongy bone tissue, which is lighter and allows for the absorption of shock.
- The diaphysis is composed of compact bone tissue, which is denser and provides strength and support to the bone structure.

3. **Analyzing the Options:**
- **Option A:** "End and shaft of long bone respectively." This is correct because it accurately describes the epiphysis as the end and the diaphysis as the shaft.
- **Option B:** "Shaft and end of long bone respectively." This is incorrect as it reverses the definitions.
- **Option C:** "Head and neck of long bone." This is incorrect because it does not accurately represent the terms.
- **Option D:** "Spongy bone only." This is incorrect because it only refers to the epiphysis and ignores the diaphysis.

4. **Conclusion:**
- The correct answer is **Option A:** "End and shaft of long bone respectively."