Question

Bone marrow occurs in ________________.

• A. Ribs and sternum
• B. Ribs, sternum and cranium
• C. Ribs and cranium
• D. Only ribs

Answer 1

The correct option is B Ribs, sternum and cranium

• Bone marrow is the soft blood-forming tissue that fills the cavities of bones and it contains fat and immature and mature blood cells including WBC, RBC and platelets.
• In adults humans, red bone marrow is primarily located in the central skeleton, such as pelvis, sternum, cranium, ribs, vertebrae and scapulae, variably found in the proximal epiphyseal ends of long bones such as femur and humerus. Hence, Bone marrow occurs in Ribs, sternum and cranium.

So, the correct answer is 'Ribs, sternum and cranium'.