Question

During fetal development the primary site(s) of red blood cell production is/are

A) bone marrow.
B) liver.
C) thymus.
D) kidneys.
E) liver and spleen.

Answer 1

The primary site of red blood cell production during fetal development is the bone marrow.

Step-by-step explanation:

The primary site(s) of red blood cell production during fetal development is bone marrow. In the embryo, blood cells are initially made in the yolk sac. As development progresses, the function is taken over by the spleen, lymph nodes, and liver. Finally, the bone marrow becomes the main site of hematopoiesis, where red blood cells, white blood cells, and platelets are produced.