Stem Cells That Will Form B Cells or NK Cells

Question

Stem cells that will form B cells or NK cells are found only in the
A) red bone marrow.
B) liver.
C) spleen.
D) thymus.
E) kidneys.

Accepted Answer

Stem cells that will form B cells or NK cells are found in the red bone marrow, which is a major site of hematopoiesis (blood cell formation) in adults. The liver, spleen, thymus, and kidneys do not have a significant role in the production of these immune cells.