11. What is bone marrow, and where is it found?

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Bone marrow is a soft, spongy tissue found in the center of certain bones. It plays a crucial role in the production of blood cells, including red blood cells, white blood cells, and platelets. There are two types of bone marrow:

1. **Red Bone Marrow**: This type is responsible for hematopoiesis, the process of blood cell production. It contains hematopoietic stem cells, which can develop into various types of blood cells. Red bone marrow is primarily found in the flat bones (such as the pelvis, sternum, and ribs) and the ends of long bones (like the femur and humerus).

2. **Yellow Bone Marrow**: This type mainly consists of adipose (fat) tissue and serves as a storage site for fats. In adults, yellow marrow is found in the central cavities of long bones.

Overall, bone marrow is essential for maintaining healthy blood cell levels and supporting the immune system.
Bone marrow is soft, spongy tissue inside certain bones. It makes blood cells, including red blood cells, white blood cells, and platelets. It's found in flat bones like the pelvis and ribs, and in the ends of long bones like the femur and humerus.

11. What is bone marrow, and where is it found?

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