Question

multiple choice question
all lymphocytes originate in the ______.
o liver
o red bone marrow
o yellow bone marrow
o spleen
o lymph nodes

Explanation:

Lymphocytes are a type of white - blood cell. Hematopoietic stem cells in the red bone marrow give rise to all lymphocytes. The red bone marrow is the primary site of blood cell production, including lymphocytes. Other organs like the liver, yellow bone marrow, spleen, and lymph nodes have different functions related to the immune system but are not the origin of lymphocytes.

Answer:

B. red bone marrow