The following points highlight the five main components of human immunity system. The components are: 1. Origin and Differentiation of Lymphocytes 2. The Major Histocompatibility Complex 3. Cytokines 4. Antigen 5. Antibodies. 1. Origin and Differentiation of Lymphocytes: In adults, all kinds of blood cells originate from bone marrow stem cells. These are distinguished into two major types — the [...]
In this article we will discuss about the resistance of human body against foreign agents. While the innate non-specific defense mechanisms are present in the body since birth, the acquired resistance develops in the body only in response to a foreign agent. Such resistance is effective only against the agent which evokes the response and not to other agents. Thus, [...]
In this article we will discuss about the autoimmune and immunodeficiency disorders. Autoimmune Disorders: (i) Autoimmunity: A fundamental property of the immune system is its ability to recognize the body's own cells and the antigens present in them as self-antigens. Under normal conditions, the immune system does not attack self-antigens. This ability — tolerance, develops while the immune cells like [...]