Cellular immunity is mediated primarily by:

Cellular immunity is mediated primarily by:

• A. T lymphocytes.
• B. B lymphocytes.
• C. Macrophages.
• D. Neutrophils.

Answer: (A)

Cellular immunity is the arm of adaptive immunity that relies on T lymphocytes to recognize and respond to antigens. T cells specialize in attacking infected cells and coordinating other immune cells: cytotoxic T cells destroy virus-infected or malignant cells, while helper T cells activate both B cells (humoral immunity) and macrophages to enhance their responses. B lymphocytes handle humoral immunity by producing antibodies. Macrophages and neutrophils are key innate phagocytes and support T cell responses, but they are not the primary mediators of cellular immunity, which is driven by T lymphocytes.

Cellular immunity is the arm of adaptive immunity that relies on T lymphocytes to recognize and respond to antigens. T cells specialize in attacking infected cells and coordinating other immune cells: cytotoxic T cells destroy virus-infected or malignant cells, while helper T cells activate both B cells (humoral immunity) and macrophages to enhance their responses. B lymphocytes handle humoral immunity by producing antibodies. Macrophages and neutrophils are key innate phagocytes and support T cell responses, but they are not the primary mediators of cellular immunity, which is driven by T lymphocytes.