The Developmental Stage at Which Erythrocytes Enter the Circulation Is

Question

The developmental stage at which erythrocytes enter the circulation is as
A) hemocytoblasts.
B) reticulocytes.
C) band forms.
D) myeloid cells.
E) proerythrocytes.

Accepted Answer

Erythrocytes enter the circulation as reticulocytes, which are immature red blood cells that still have residual ribosomal material. They eventually lose this material and fully mature into erythrocytes. Hemocytoblasts, myeloid cells, and proerythrocytes are all earlier stages of red blood cell development, while band forms are a type of immature white blood cell.