Final answer:
Regenerative anemia is differentiated from nonregenerative anemia by the presence of anisocytosis, polychromasia, and reticulocytosis, all of which indicate the body's increased production of RBCs in response to anemia. Thus, the correct answer is D. All of the above.
Step-by-step explanation:
Regenerative anemia can be differentiated from nonregenerative anemia by the presence of several factors. A common denominator in regenerative anemia is the body's response to anemia by increasing the production of red blood cells (RBCs).
Key indicators of this response include anisocytosis, which is a variation in the size of RBCs, polychromasia, which refers to the presence of more youthful RBCs that are typically bluish in color because of residual ribosomal RNA, and reticulocytosis, which is an increase in the number of reticulocytes, the immature forms of RBCs still containing organelle remnants.
The correct answer for differentiating regenerative from nonregenerative anemia by the presence of these indicators is D. All of the above. These adjustments are part of the body's compensatory mechanism to counteract the reduced oxygen-carrying capacity during anemia.