This document provides a detailed overview of the immune system, encompassing both innate and adaptive immunity. It begins with an introduction to the fundamental principles of immunology, differentiating between the static nature of the innate system and the responsive characteristics of the adaptive system. The content explores key cellular components, including cytotoxic T lymphocytes and helper T lymphocytes, alongside the major principles governing immune responses. Hemopoiesis and lymphopoiesis are discussed, detailing the development of blood cells and lymphocytes respectively. The organization of immune cells within lymphoid organs, such as the thymus, lymph nodes, and spleen, is explained. The structure and function of antibodies (immunoglobulins) are also covered, along with a comparison of T cell receptors and B cell receptors. The document concludes with a discussion of central tolerance and the mechanisms of positive and negative selection in T cell development.
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