Yellow bone marrow is found especially in the medullary cavity of

Options

A. Short bones
B. Spongy bones
C. Long bones
D. All of these

Answer

**Step-by-Step Solution:**

1. **Understanding Bone Marrow Types**: There are two main types of bone marrow: red bone marrow and yellow bone marrow. Red bone marrow is responsible for producing red blood cells (RBCs), while yellow bone marrow primarily serves as a fat storage area.

2. **Location of Red Bone Marrow**: Red bone marrow is predominantly found in certain bones such as the ribs, skull, vertebrae, and pelvic bones. It is mainly present in children, as they require more RBC production for growth and development.

3. **Characteristics of Yellow Bone Marrow**: Yellow bone marrow is primarily located in the medullary cavity of long bones. It consists mainly of adipose (fat) tissue and can convert back to red bone marrow in cases of severe blood loss to increase RBC production.

4. **Identifying the Correct Option**: The question asks where yellow bone marrow is especially found. Since yellow bone marrow is primarily located in the medullary cavity of long bones, the correct answer is option C: long bones.

5. **Conclusion**: Therefore, yellow bone marrow is found especially in the medullary cavity of long bones.

**Final Answer**: Yellow bone marrow is found especially in the medullary cavity of long bones (Option C).

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