Question

Originating from bone marrow, circulating in blood for $1-2$ days and passing into connective tissue as macrophages are _____________.

• A. Lymphocytes
• B. Basophils
• C. Eosinophils
• D. Monocytes

Answer 1

The correct option is D Monocytes

Monocytes are produced by the bone marrow from precursors called monoblasts, bipotent cells that differentiated from hematopoietic stem cells. Monocytes circulate in the bloodstream for about one to three days and then typically move into tissues throughout the body where they differentiate into macrophages and dendritic cells.

So, the correct answer is 'Monocytes'.