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The immune system protects the body against invading microbes such as bacteria, viruses and parasites. Some of the general front-line immune defences are the skin and various membranes, but a variety of internal organs and cells provide very specific defences. Organs involved in this process include white blood cells (T-cells and B-cells), thymus (matures T-cells), bone marrow (produces WBCs), tonsils (protect the throat), lymph nodes, and the spleen. Other defensive body processes include stomach acid, various cleaning secretions (e.g. tears, saliva, vaginal secretions, etc.), nasal hairs, mucus in the throat and respiratory system, and cilia in the mucus.
Although the immune system usually prevents disease, sometimes it can cause it. There are several diseases caused by an overactive immune system such as allergies, asthma, autoimmune diseases (more than 100), and hay fever.
Parts of the immune system can become diseased. Failure of the entire immune system is immune deficiency such as in AIDS and primary immune deficiency (such as SCID). Cancer can afflict immune system cells: leukemia is cancer of blood cells (usually white blood cells), multiple myeloma is cancer of plasma cells (a type of B-cell), and lymphoma is cancer of the lymph nodes; also possible is thymus cancer. The solid organs such as the tonsils and spleen can become infected like any other organ (e.g. tonsilitis, splenomegaly).
Immune system: The complex group of organs and cells that defends the body against infections and other diseases.
Source: National Institute of Health
Immune system: a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response
Source: WordNet 2.1
Immune system : includes the thymus, spleen, lymphatic system, bone marrow, tonsils, and Peyer's patches, and the migratory cells these organs generate: lymphocytes, granulocytes, and cells of the monocyte- macrophage type.
immune system — a complex network of specialized cells, tissues, and organs that defends the body against attacks by disease-causing microbes. (Source: excerpt from Microbes in Sickness and in Health -- Publications, National Institute of Allergy and Infectious Diseases: NIAID)
Immune system: The immune system includes the organs, structures and substances that provide the body with a defence against infection from micro-organisms that cause infections and many diseases. The immune system includes the lymphatic system, tonsils, thymus, spleen, appendix and bone marrow. The immune system can respond to the threat of infection in three ways: the anatomic response, the immune response and the inflammatory response.
The immune system interacts and works together with every other system in the body, including the nervous system, genitourinary system, musculoskeletal system, circulatory system, respiratory system, digestive system and endocrine system.
Immune system: The body's system for protecting itself from viruses and bacteria or any "foreign" substances. (Source: excerpt from Kidney Failure Glossary: NIDDK)
The following organs are closely related to the organ: Immune system:
The following conditions are related to the organ: Immune system:
The following list contains sub-parts of the organ: Immune system:
These symptoms are related to afflictions of the organ: Immune system:
Condition count: 145 ; see list below.
Main condition: Immune disorders
Organs: list of all organs
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