What functions do leukocytes primarily serve in the body?

Leukocytes, commonly known as white blood cells, primarily serve the vital function of fighting infection in the body. They are a key component of the immune system, which protects the body against various pathogens, such as bacteria, viruses, and fungi. Leukocytes identify these foreign invaders and work to neutralize or destroy them through various mechanisms, including the release of antibodies and the engulfing of pathogens via a process called phagocytosis.

In addition to their primary role in infection control, leukocytes also play a role in the immune response by coordinating the overall response to pathogens and providing long-term immunity through memory cells. Their presence and activity are critical in maintaining health and preventing disease, highlighting their essential function in the body's defense mechanisms.