Which type of blood cell is responsible for fighting infection?

Leukocytes, or white blood cells, play a crucial role in the immune system by identifying and combating infections. They are produced in the bone marrow and are part of the body's defense mechanism against pathogens like bacteria and viruses. There are several types of leukocytes, each with specific functions; for instance, neutrophils are effective against bacterial infections, while lymphocytes target viruses.

In contrast, erythrocytes, or red blood cells, primarily function to transport oxygen from the lungs to the body tissues and carbon dioxide from the tissues back to the lungs. Thrombocytes, or platelets, are essential for blood clotting, aiding in the healing process of injuries. Thus, while all these blood cells contribute to different aspects of health, it is the leukocytes that are specifically tasked with fighting infections and maintaining the body's immune response.