SSC CGL
MediumQ. No. the-main-function-of-white-blood-cells-is
The main function of white blood cells is
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ACarrying oxygen
BClotting blood
CFighting infections
DProducing hormones
Correct Answer: Fighting infectionsYour Answer: C
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✅ Correct Answer: C — Fighting infections
White Blood Cells (WBCs/Leukocytes) are the soldiers of the immune system. Their main function is to protect the body from infections and foreign substances. Different WBC types: Neutrophils (engulf bacteria), Lymphocytes (produce antibodies), Monocytes, Eosinophils, and Basophils.
❌ Why other options are wrong:
• A. Carrying oxygen — Oxygen is carried by Red Blood Cells (RBCs) using haemoglobin. WBCs have no role in oxygen transport.
• B. Clotting blood — Blood clotting is done by Platelets (Thrombocytes) with clotting factors (fibrinogen, etc.). WBCs don't do clotting.
• D. Producing hormones — Hormones are produced by endocrine glands (thyroid, adrenal, pituitary). WBCs don't produce hormones.
📝 Important Note: RBC = O2 transport (using haemoglobin). WBC = Immunity/fighting infections. Platelets = Blood clotting. Normal WBC: 4,000-11,000/cu mm. WBC increase (leukocytosis) = infection. WBC decrease (leukopenia) = immunodeficiency. SSC CGL top blood cell question.
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