The immune system is a body's defense against infectious organisms and many other types of destructive trespassers. It is a system of biological processes in a living being that defends against diseases and other infections by destroying pathogens. The human immune system detects and kills different types of viruses and parasitic worms. It identifies and classifies the infections as some intruders form a part of â€health cells' which are required for the functioning of human body. The mode of attack differs against different harmful intruders. Immune response is a series of steps and mechanisms taken by our immune system to neutralize the multifaceted pathogens. Human immune system is known to adapt with due course of time to certain type of pathogens and recognize them. This process is called â€acquired immunity' or â€adaptive immunity' due to immunological memory. The complexity of the system can be gauged by the fact that many pathogens are known to change forms and form mutations which don't need much to survive. The immune system is made up of special cells, tissues, organs and proteins which interact with each other to form a dynamic network called the immune system. The organs of human immune system include the lymph nodes, tonsils, lymphatic vessels, thymus, spleen and Peyer's patch. These organs produce the cells that participate in the immune response or operate as locations for immune function. The functions of main organs of an immune system are discussed below. Lymph Nodes: - These are minute aggregations of tissues interspersed within the complex lymphatic system. Lymph nodes contain while blood cells which form a part of the immune system's response. While blood cells are also called as lymphocytes. Lymphatic Fluids: - These fluids circulate through lymph nodes by means of lymphatic vessels. The lymph filters through lymph nodes and due to this, foreign cells of microorganisms are distinguished and either overpowered or removed. Tonsils: - Tonsils are located at the farthest point of our throats under our tongues. These contain many lymphocytes that filter harmful bacteria which enter via our mouth and nasal cavity. Peyer's Patches: - These are lymphatic tissues performing the same function as the digestive system. Peyer's patches are spread in the small intestine and appendix. Like tonsils, they are also filled with lymphocytes. The Thymus Gland: - It is another site for lymphocyte production, located near the upper chest region. Its production is the highest during our initial days (childhood) of growth. It shrinks in size as per our age.
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