Which blood component is responsible for fighting infections?

White blood cells, also known as leukocytes, play a crucial role in the immune system by fighting against infections and foreign invaders such as bacteria, viruses, and fungi. They are produced in the bone marrow and circulate throughout the body in the bloodstream, acting as the body's defense mechanism. When pathogens enter the body, white blood cells are among the first responders, identifying, attacking, and eliminating these harmful entities.

There are several types of white blood cells, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each with a specific function in the immune response. For example, neutrophils are typically the first to arrive at the site of infection, while lymphocytes are essential for the adaptive immune response, remembering past infections to provide long-lasting immunity.

In contrast, plasma is the liquid portion of blood that carries nutrients, hormones, and waste products; platelets are involved in blood clotting; and red blood cells primarily transport oxygen throughout the body. While all these components work together to maintain overall health, it is the white blood cells that are specifically responsible for combating infections.