True or False: All lymphocytes are leukocytes.

All lymphocytes are classified as leukocytes because they are a type of white blood cell involved in the immune response. Leukocytes serve various functions in immunity, and lymphocytes, which include T cells, B cells, and natural killer (NK) cells, play critical roles in adaptive immunity and immune regulation.

Leukocytes are broadly divided into several categories, among which lymphocytes are specifically known for their role in targeting specific pathogens and providing long-lasting immunity. The classification of lymphocytes as leukocytes aligns with the definition of leukocytes as any of the white blood cells that are involved in the body’s defense mechanisms.

While not all leukocytes are lymphocytes (there are other types such as neutrophils, basophils, eosinophils, and monocytes), the statement that all lymphocytes are leukocytes is accurate and reflects the hierarchical organization of immune cells. This understanding emphasizes the multifaceted nature of the immune system, where lymphocytes contribute significantly to both innate and acquired immunity.