Question

question 73
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to which cell does the myeloid stem cell first differentiate into en route to become a rbc?
reticulocyte
proerythroblast
erythrocyte
macrophage

Explanation:

Myeloid stem cells differentiate into various blood cells. The process of becoming a red blood cell (RBC) starts with the myeloid stem cell differentiating into a proerythroblast. A reticulocyte is an immature RBC that comes after the proerythroblast stage. An erythrocyte is a mature RBC. A macrophage is a type of white blood cell (not in the direct lineage to become an RBC from a myeloid stem cell in the context of this question).

Answer:

Proerythroblast