Which blood component fights infection?

Which blood component fights infection?

• A. Platelets
• B. White Blood Cells
• C. Red Blood Cells
• D. Plasma

Answer: (B)

White blood cells are the blood component that fights infection. They are part of the immune system and patrol the body to detect and attack bacteria, viruses, and other pathogens. They can engulf invaders (phagocytosis), release chemicals to recruit more immune cells, and some types produce antibodies to help neutralize threats. Other components have different jobs: platelets help with clotting to stop bleeding, red blood cells carry oxygen, and plasma is the liquid that transports cells and proteins, including some antibodies, but it doesn’t actively attack pathogens.

White blood cells are the blood component that fights infection. They are part of the immune system and patrol the body to detect and attack bacteria, viruses, and other pathogens. They can engulf invaders (phagocytosis), release chemicals to recruit more immune cells, and some types produce antibodies to help neutralize threats. Other components have different jobs: platelets help with clotting to stop bleeding, red blood cells carry oxygen, and plasma is the liquid that transports cells and proteins, including some antibodies, but it doesn’t actively attack pathogens.