Question

The red bone marrow occurs in
(a)Ribs
(b)Ribs and sternum
(c)Ribs and cranium
(d)Ribs, sternum, and cranium

Answer 1

Hint: Red bone marrow is the location where the production of red blood cells and platelets occurs. Most of the lymphocytes are also produced in it. It surrounds the yellow bone marrow in the spongy portion of the bone.

Complete answer:
Ribs, sternum, and cranium- all are red bone marrow. This is a tissue made of the hematopoietic cells and is the producer of the blood cells. The hormone called Erythropoietin plays a role in that. Along with these Bones, the hip bone, breast bone, skull, vertebrae, and shoulder blades also contain red bone marrow.

Additional Information:
Bone marrow is present in the spongy portion of certain bones and produces new blood cells in birds and mammals. It is made of marrow adipose tissue, hematopoietic cells, and stromal cells. The human bone marrow produces 500 billion blood cells per day.
All RBCs and platelets including 60-70% of lymphocytes are produced in the red bone marrow of our body. The rest of the lymphocytes are produced in the lymphatic tissues including the spleen, thymus, and nodes.
Besides red bone marrow, there's another type known as yellow bone marrow which mainly stores fats and provides sustenance as well as maintains a suitable environment for the bone to function. It is present in the central cavities of long bones and a layer of red marrow surrounds it.
Therefore, the correct answer to the question is “ribs, sternum, and cranium”.

Note: Sometimes due to diseases such as leukemia, aplastic anemia, and sickle cell anemia, transplantation of bone marrow becomes necessary. Transplant of bone marrow regenerates a new immune system in the body that can fight with existing leukemia and other cancers.