This module outlines what the immune system is and how it works to protect us. This explores both the innate immune system and the adaptive immune system. Learners will gain an understanding of the functions of phagocytes, B-cells and T-cells. This module outlines the types of Major Histocompatibility Complex. This module discusses Helper T-cells and Cytotoxic T-cells and this module concludes by examining the role and functions of the body's inflammatory response.