What is the primary function of leukocytes?

The primary function of leukocytes, commonly known as white blood cells, is to protect the body against infection. These cells are a crucial component of the immune system and are responsible for identifying and responding to pathogens such as bacteria, viruses, and other foreign invaders. They play a variety of roles, including the ability to engulf and destroy pathogens through a process known as phagocytosis, as well as producing antibodies that target specific pathogens for destruction.

Leukocytes also help in modulating the immune response by signaling other parts of the immune system, thus ensuring a coordinated and effective response to infections. Different types of leukocytes, such as lymphocytes, neutrophils, and macrophages, have specialized functions that contribute to this protective role.

The other options presented do not accurately capture the primary function of leukocytes. For instance, aiding in blood clotting is primarily the function of platelets, while the transport of oxygen is the role of red blood cells. Regulating body temperature is primarily managed by the hypothalamus and various physiological responses in the body. Each of these functions is essential to overall health, but they do not pertain to the specific role of leukocytes in the immune system.