Large, immature, oblong-shaped erythrocytes cells are called what?

Question

BlackTom AI · Accepted Answer

Megaloblasts are large, immature, nucleated erythroid precursor cells, so the correct answer is d. Megaloblasts.

1) Relevant knowledge points and concepts
- Erythropoiesis produces successive precursor forms; normal maturation yields progressively smaller, non‑nucleated erythrocytes. 
- “Megaloblastic” refers to impaired DNA synthesis (classically from vitamin B12 or folate deficiency), producing abnormally large erythroid precursors with delayed nuclear maturation. 
- Morphology: these cells are large (macrocytic), often oval or oblong (macro‑ovalocytes), and retain nuclei in marrow (megaloblasts) or show characteristic peripheral macrocytosis (large RBCs) and hypersegmented neutrophils.

2) Step-by-step reasoning
- The question asks for the name of “large, immature, oblong‑shaped erythrocytes.” That description matches macro‑oval erythroid precursors seen when DNA synthesis is defective. 
- The term “megaloblast” specifically denotes those large, immature, nucleated erythroid precursors in the bone marrow (mega = large, blast = immature cell). 
- Therefore, megaloblasts correspond exactly to “large, immature, oblong‑shaped erythrocytes.”

3) Intermediate observations (morphologic/lab clues)
- MCV (mean corpuscular volume) is typically elevated (>100 fL) in megaloblastic anemia.
- Peripheral smear: macro‑ovalocytes and hypersegmented neutrophils are seen.
- Pathophysiology: impaired DNA replication leads to nuclear‑cytoplasmic asynchrony (large cytoplasm with immature nucleus), producing the described morphology.

4) Why the correct answer is correct
- “Megaloblasts” literally and clinically describe large, immature, often oval erythroid precursors — exactly matching the description in the question.

5) Why other options are incorrect
- a. Microblasts: “micro‑” denotes small, not large, so incorrect. 
- b. Corpuscular: nonspecific adjective meaning “relating to cells” and not a name for large immature RBCs. 
- c. Sickle: describes crescent‑shaped erythrocytes seen in sickle cell disease, not large/oblong immature cells.

6) Conclusion
- The description corresponds to megaloblasts; therefore the final answer is d. Megaloblasts (matches the provided answer).

Large, immature, oblong-shaped erythrocytes cells are called what?单项选择题

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