Question

All blood cells in an adult human can trace their ancestry to which compartment within the body?

1) Thymus
2) Bone marrow
3) Lymph node
4) Peyer's patch
5) None of the above

Answer 1

2) The Bone Marrow

Answer 2

All blood cells in an adult human can trace their ancestry to bone marrow, which is where most hematopoietic functions occur. B cells mature in the red bone marrow, and immature T cells mature largely in the thymus gland.

Step-by-step explanation:

All blood cells in an adult human can trace their ancestry to bone marrow. In embryonic development, blood cells are initially made in the yolk sac but are later produced in the spleen, lymph nodes, and liver. However, the bone marrow is where most hematopoietic functions occur, and it is where the final stages of differentiation for many cells take place. B cells, for example, undergo nearly all of their development in the red bone marrow, while immature T cells mature largely in the thymus gland.