Question

The only bone marrow cell that never appears in peripheral blood is

• A. Myeloblast
• B. Myelocyte
• C. Lymphoblast
• D. Megaloblast.

Answer 1

The correct option is A Myeloblast

A. Myloblast

Reason: The myeloblast is a unipotent stem cell that differentiates into granulocyte cells. Myeloblasts reside extravascularly in the bone marrow. Hematopoiesis takes place in the extravascular cavities between the sinuses of the marrow. The wall of the sinuses is composed of two different types of cells, endothelial cells, and adventitial reticular cells. The hemopoietic cells are aligned in cords or wedges between these sinuses, with myeloblasts and other granular progenitors concentrated in the subcortical regions of these hemopoietic cords. So the correct option is A.