The most common leukocytes in blood are _____.

Question

BlackTom AI · Accepted Answer

Neutrophils constitute approximately 50–70% of circulating white blood cells, making them the single most abundant leukocyte type in normal peripheral blood.

1. Relevant knowledge points and concepts
- Leukocytes (white blood cells) are classified into granulocytes (neutrophils, eosinophils, basophils) and agranulocytes (lymphocytes, monocytes).
- Normal differential white blood cell count gives typical percentage ranges: neutrophils ~50–70%, lymphocytes ~20–40%, eosinophils ~1–4%, basophils <1%, monocytes ~2–8%.
- Neutrophils are polymorphonuclear granulocytes central to acute innate immune responses and phagocytosis of bacteria.

2. Step-by-step reasoning
- Start with a hypothetical sample of 100 circulating leukocytes to translate percentage ranges into counts.
- If neutrophils are 50–70% → 50 to 70 cells out of 100.
- Lymphocytes at 20–40% → 20 to 40 cells.
- Eosinophils at 1–4% → 1 to 4 cells.
- Basophils at <1% → fewer than 1 cell on average per 100 (very rare).
- Comparing these counts shows neutrophils have the largest absolute number (50–70) versus the others.

3. Calculations / intermediate steps
- For 100 WBCs: neutrophils = 50–70; lymphocytes = 20–40; eosinophils = 1–4; basophils <1.
- Example midpoint: neutrophils ~60, lymphocytes ~30, eosinophils ~2, basophils ~0.5 per 100 cells.

4. Why the correct answer is correct
- The numerical differential and functional role confirm neutrophils are the most numerous leukocyte type in normal blood. Their abundance reflects their role as first-line phagocytes against bacterial infection.

5. Why the other options are incorrect
- Basophils: rare (<1%), involved in allergic responses and histamine release—not most common.
- Lymphocytes: second most common (20–40%) and key to adaptive immunity, but fewer in number than neutrophils.
- Eosinophils: low percentage (1–4%), involved in parasitic infections and allergic modulation—not the most abundant.

6. Conclusion
- Given the normal differential percentages and comparative counts, the most common leukocytes in blood are Neutrophils, which matches the provided answer.

The most common leukocytes in blood are _____. 单项选择题

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