ATI Pathophysiology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

White blood cells, also known as leukocytes, play a crucial role in the immune response by identifying and combating infections and foreign substances that invade the body. They are key components of the immune system and have various types, each with specialized functions. For example, neutrophils and macrophages are types of white blood cells that are primarily involved in the initial response to infection, actively engulfing and destroying pathogens. Lymphocytes, including B cells and T cells, are vital for the adaptive immune response, helping to recognize specific antigens and orchestrate a tailored attack against these invaders.

This immune activity is essential for preventing illness and maintaining health. White blood cells can also produce antibodies, facilitating the targeting and elimination of pathogens. Their ability to remember previous invaders enhances the efficiency of future responses, which is the basis of acquired immunity.

The other answer choices do not accurately represent the primary function of white blood cells. Oxygen transport is the role of red blood cells. Hormone production is primarily associated with endocrine glands and specific cells rather than white blood cells. Blood clotting is regulated by platelets and clotting factors, not by white blood cells.