Which component of blood helps fight infection?

• A. Plasma
• B. White blood cells
• C. Platelets
• D. Red blood cells

Answer: (B)

Verified step by step guidance

1. Understand the primary functions of each blood component: Plasma, White blood cells, Platelets, and Red blood cells.
2. Plasma is the liquid portion of blood that carries cells and nutrients throughout the body.
3. White blood cells (leukocytes) are part of the immune system and are responsible for fighting infections and foreign invaders.
4. Platelets are involved in blood clotting and help prevent bleeding.
5. Red blood cells are responsible for carrying oxygen from the lungs to the rest of the body and returning carbon dioxide to the lungs for exhalation.