What is one of the main roles of white blood cells?

White blood cells, also known as leukocytes, play a crucial role in the immune system by fighting infections. They are integral to the body’s defense mechanism against pathogens such as bacteria, viruses, fungi, and parasites. When the body detects an invader, white blood cells respond by identifying, targeting, and destroying these harmful entities. They accomplish this through various processes, such as phagocytosis, where certain types of white blood cells engulf and digest pathogens, and the production of antibodies that neutralize threats.

In terms of function, white blood cells are a vital component of the immune response, not only by attacking infections but also by aiding in the recovery process and maintaining overall immune health. This role is fundamentally distinct from that of transporting oxygen, regulating blood sugar, or providing structural support to tissues, which are functions associated with red blood cells, insulin, and connective tissues, respectively. Each of those functions is indeed important for overall health, but they do not pertain to the primary function of white blood cells in combating infections.