The functions of white blood cells and their types are expounded in detail in this post. White blood cells are anti-infectious cells that are components of your immune system and, often referred to as leukocytes are in charge of defending your body against illness. These cells travel through your blood and tissues, fighting any unknown germs that infiltrate your body in response to damage or sickness. White blood cells circulate in the bloodstream, where they pass through blood vessel walls and tissues, searching for the source of infection. Please click for more.