Medicine & USMLE

T-Lymphocytes Overview

  1. Innate Immunity
  2. Adaptive Immunity
  3. Macrophages
  4. Neutrophils
  5. Dendritic Cells
  6. Mast Cells
  7. Eosinophils
  8. Basophils
  9. Natural Killer Cells
  10. Antigens
  11. MHC I and II
  12. Antibodies
  13. B Lymphocytes Overview
  14. B Cell Stages
  15. B-Cell Activation
  16. Plasma B-Cells
  17. Memory B-Cells
  18. T-Lymphocytes Overview
  19. T-Cell Stages
  20. Types of Activated T-Cells


T-cells, also known as T-lymphocytes, are a class of white blood cells that operate in our adaptive immune response. T-cells act by direct contact to either kill infected cells or by coordinating an immune response with other immune cells. T-cells directly bind to antigens presented on MHC, and when the antigen is abnormal, the T-cell will either act to directly kill the cell or coordinate a concerted immune response against the threat. Notably, because the T-cell works directly via contact, this response is known as the cell-mediated immune response.

Key Points

  • T-Lymphocytes (T Cell) Overview