Which term best describes the function of blood when considering the presence of leukocytes and antibodies?

Question

BlackTom AI · Accepted Answer

Leukocytes are white blood cells that, together with antibodies, carry out immune defenses in the blood, so the correct functional term is Protection.

1. Relevant knowledge points and concepts
- Major functions of blood: transportation (e.g., gases, nutrients), regulation (e.g., temperature, pH, fluid balance), and protection (immune defense and clotting).
- Leukocytes (neutrophils, eosinophils, basophils, monocytes/macrophages, lymphocytes) are cellular components responsible for identifying, engulfing, and destroying pathogens, and coordinating immune responses.
- Antibodies (immunoglobulins) are proteins produced by B lymphocytes/plasma cells that neutralize pathogens, mark them for destruction (opsonization), and activate complement pathways.

2. Step-by-step reasoning
- Premise: The question specifies blood contains leukocytes and antibodies.
- Step 1: Identify the primary role of leukocytes: detect and eliminate infectious agents and abnormal cells.
- Step 2: Identify the primary role of antibodies: bind specific antigens to neutralize pathogens and facilitate their removal.
- Step 3: Match these roles to the blood function categories: both leukocytes and antibodies serve defensive, immune roles, which fall under Protection.

3. Intermediate logical steps
- Leukocytes perform phagocytosis and cell-mediated immunity; antibodies perform humoral immunity.
- These actions prevent infection and remove foreign material — key protective functions of blood.

4. Why the correct answer is correct
- “Protection” directly describes immune defense provided by leukocytes and antibodies. Their molecular and cellular actions (neutralization, opsonization, phagocytosis, complement activation, cytotoxic responses) are protective mechanisms.

5. Why other options are incorrect
- Regulation: pertains to maintaining homeostasis (temperature, pH, osmotic balance), not primarily the activities of leukocytes/antibodies.
- Transportation: describes movement of gases, nutrients, wastes; while antibodies circulate, their primary role is immune defense, not transport.

6. Conclusion
Therefore, given the presence and functions of leukocytes and antibodies, the best descriptor is Protection — confirming the provided answer.

Which term best describes the function of blood when considering the presence of leukocytes and antibodies?单项选择题

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