Question

Bone marrow of long bones are the sites of

• A. Production of WBC's
• B. Production of RBC's
• C. Production of blood
• D. Breakdown of RBC's

Answer 1

The correct option is B Production of RBC's

A) There are two types of white blood cells, T and B cells (lymphocytes). T cells are produced and mature in the thymus gland while B cells are produced and mature in the bone marrow.

B) RBCs are produced in the bone marrow.

C) RBCs, some WBCs, and platelets are formed in the bone marrow, but the plasma is not formed in the bone marrow.

D) Old or damaged RBCs are broken down by macrophages in the spleen and liver.

So the correct answer is 'Production of RBC's'.