Milady Anatomy and Physiology Practice Exam – Prep Questions & Study Guide

Cell-mediated immunity is a crucial component of the adaptive immune system that primarily involves T-cells. These T-cells, which include various subtypes such as cytotoxic T-cells and helper T-cells, play a direct role in identifying and destroying infected cells or coordinating the immune response.

In cell-mediated immunity, T-cells respond to specific antigens presented on the surface of infected or abnormal cells. This direct interaction allows for targeted immune responses, making it particularly effective against intracellular pathogens such as viruses and certain bacteria, as well as tumor cells.

Understanding this distinction is important as it highlights the specificity and function of T-cells in the immune response, differentiating it from other types of immunity. Humoral immunity, on the other hand, relies on B-cells that produce antibodies, while passive immunity involves the transfer of antibodies from one individual to another and natural immunity typically refers to innate defenses the body is born with or acquired through natural exposures.