Red bone marrow is found in the epiphysis and is responsible for producing blood cells.

• A. Yellow Bone Marrow
• B. Epiphysis
• C. Diaphysis
• D. Red Bone Marrow

Answer: (D)

Hematopoiesis, the production of blood cells, occurs in red bone marrow. This tissue is rich in hematopoietic stem cells that differentiate into red blood cells, white blood cells, and platelets. In long bones, red marrow is found in the epiphyses—the ends of the bone—and also in certain flat bones, making it the specific tissue responsible for blood cell formation.

Yellow marrow is primarily fat storage and does not actively produce blood cells. The epiphysis is a bone region where red marrow is located, not a type of marrow itself, and the diaphysis is the shaft of the bone, which mostly contains yellow marrow in adults. Therefore, the term that best fits both the location and function described is red bone marrow.