Which type of leukocyte can be categorized into T cells, B cells, and Natural Killer cells?

Lymphocytes are a specific type of leukocyte that play a crucial role in the immune response. Within this category, T cells, B cells, and Natural Killer (NK) cells each have distinct functions in protecting the body against pathogens.

T cells are involved in direct cellular immune responses and can help activate other immune cells or directly kill infected cells. B cells primarily focus on producing antibodies, which are critical for targeting specific antigens and neutralizing pathogens. Natural Killer cells contribute to the innate immune response by identifying and destroying infected or cancerous cells without the need for prior sensitization.

The classification of lymphocytes into these distinct subtypes illustrates their specialized roles within the immune system. This specialization highlights why lymphocytes are considered a separate category from other leukocyte types such as granulocytes (which include neutrophils, eosinophils, and basophils) and monocytes, which have different functions in immune defense and inflammation.