Which component of blood plays a key role in the control of infection?

White blood cells are crucial for the body's immune response and play a central role in the control of infection. They help to identify and destroy pathogens such as bacteria, viruses, and other foreign invaders. There are various types of white blood cells, including lymphocytes, neutrophils, and monocytes, each with specific functions in the immune system. For instance, lymphocytes are responsible for producing antibodies, while neutrophils are often the first responders to sites of infection, actively engulfing and destroying pathogens.

In contrast, platelets primarily contribute to blood clotting, red blood cells are mainly involved in transporting oxygen and carbon dioxide throughout the body, and plasma serves as the liquid component of blood that carries nutrients, hormones, and waste products but does not have a direct role in fighting infections. Understanding the distinct functions of these components clarifies why white blood cells are particularly vital in managing and combating infections within the body.