Question

Bone marrow occurs in?

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

Answer 1

The correct option is A Ribs and sternum

Bone marrow is a semi-solid tissue which may be found within the spongy or cancellous portions of bones. In birds and mammals, bone marrow is the primary site of new blood cell production or hematopoiesis. It is composed of hematopoietic cells, marrow adipose tissue, and supportive stromal cells. Bone marrow occurs in ribs and sternum and not in cranial bones.

So, the correct answer is 'ribs and sternum'.