The concentrations of different types of hematopoietic stem cells are measured in various organs extracted from aborted fetuses. Shown below is an image that depicts hematopoiesis in various organs throughout fetal life and adulthood. Which of the following most likely represents hematopoiesis in the liver?
1.A
2.B
3.C
4.D
5.E
explanation
The site of erythropoiesis varies according to the age of the fetus. Fetal erythropoiesis occur in the following organs:
Yolk sac: 3 weeks - 8 weeks
Liver: 6 weeks - birth
Spleen: 10 weeks - 28 weeks
Bone marrow: 18 weeks - adulthood
Shown below is an image that depicts erythropoiesis in fetuses and adults.