Which term describes part of the body's immune system that helps fight infection and disease?

• A. Wandering Resident
• B. Warm Application
• C. White Blood Cells
• D. Wheelchair Safety

Answer: (C)

White blood cells are the body's frontline defenders in the immune system. They circulate in blood and move into tissues to spot and attack invading organisms like bacteria and viruses. Some white blood cells engulf and destroy invaders (phagocytosis), while others coordinate the immune response or produce antibodies to neutralize threats. This collective action helps prevent infections and fight disease, making white blood cells the best description of the immune system component described.

The other options don’t describe immune function: wandering resident isn’t a medical term for immune defense, warm applications are a therapy for comfort or circulation, and wheelchair safety relates to mobility and safety rather than immune protection.