What is the function of leukocytes in the immune system?

Leukocytes, commonly known as white blood cells, play a crucial role in the immune system by protecting the body against infections. They are the key players in the body’s defense mechanism, identifying, attacking, and destroying pathogens such as bacteria, viruses, and fungi. Different types of leukocytes, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils, have specialized functions that contribute to both innate and adaptive immunity.

For instance, neutrophils are typically the first responders to sites of infection, where they quickly engulf and destroy invading organisms. Lymphocytes include T cells and B cells, which are essential for adaptive immunity: T cells help in directly killing infected cells and coordinating the immune response, while B cells are involved in producing antibodies that specifically target pathogens.

In contrast, the other functions listed in the options focus on different body systems. The transport of oxygen is the primary role of red blood cells, not leukocytes. Blood clotting is mainly facilitated by platelets and various clotting factors, while hormone production is primarily a function of endocrine glands. Thus, the main and defining function of leukocytes is indeed to protect the body against infections, solidifying their critical role in maintaining immune health