The lifespan of White Blood Cells is?

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The lifespan of White Blood Cells is? Answer: 5-21 days

White Blood Cells (WBCs), also called leukocytes, are vital for the immune system. They help the body fight infections and foreign invaders. Their lifespan varies by type: • Neutrophils may live only a few hours to a few days, • Lymphocytes can live up to weeks or even years in some cases. On average, WBCs survive for 5 to 21 days depending on their function and type.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.