Immune System Summary for Exam Prep – Innate & Adaptive Immunity

This document provides a complete and simplified summary of the human immune system, tailored for biology and medical students. It explains the three lines of defense, including physical and chemical barriers, the non-specific innate immune response, and the specific adaptive immune system. Key topics include phagocytes, natural killer cells, inflammation, fever, antimicrobial proteins, B and T cells, antibody structure and functions, antigens, MHC proteins, antigen-presenting cells (APCs), and types of immunity (active, passive, humoral, and cell-mediated). It also covers immunity-related disorders such as autoimmune diseases, immunodeficiencies, and hypersensitivities. This resource is ideal for exam revision or understanding foundational immunology concepts.