What is another name for white blood cells?

• A. Erythrocytes
• B. Platelets
• C. Leukocytes
• D. Corpuscles

Answer: (C)

Leukocytes are white blood cells—the immune system’s responders. They circulate in the blood and can move into tissues to fight infection, destroy pathogens, and coordinate immune responses. They include several specialized types—neutrophils, lymphocytes, monocytes, eosinophils, and basophils—each contributing to defense in different ways. This makes leukocytes the precise term for white blood cells. The other options refer to different components: erythrocytes are red blood cells that carry oxygen; platelets help with blood clotting; corpuscles is an old, nonspecific word not used to name this cell type.