During Fetal Development the Primary Site(s) of Red Blood Cell

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.

Accepted Answer

During fetal development, the primary site of red blood cell production is the liver and spleen. The liver is the main site of production during the early stages of development, while the spleen takes over as the primary site later in development. After birth, the bone marrow becomes the main site of red blood cell production.