Immune System

The immune system is the natural defense of the body against any foreign to the substance (allergen, infections how bacteria or viruses). Through a well organised reaction, the body attacks and destroys infectious organisms that invade it. These foreign bodies are called antigens (Ag). Location of the immune system: Found and has access in all parts of the body. All the cells that make up the immune system live in different organs called lymphoid. These organs can be divided into primary or secondary. -Primary (bone marrow and thymus), where take place the production and maturation of these cells. -Secondary (tonsils, Peyer of the intestine’s, spleen and lymph nodes), are those where already mature cells are arranged and aggressors cellular components of the Sistemainmunologico the different immune responses to the various agents are produced: 1-lymphocytes B: develop stem cells in the bone marrow.

They are in certain areas of the intestine, bone marrow, lymph nodes, spleen, and less expansion on blood flow. They have the main function produce antibodies (also called immunoglobulins). 2-Lymphocytes t develop stem cells in the bone marrow. Early in the life of the fetus, immature cells migrate to the thymus, a specialized organ of the immune system in the chest. In the thymus, immature lymphocytes develop to mature T lymphocytes (T in the thymus). Mature T cells leave the thymus and are going to other organs of the immune system, such as the spleen, lymph nodes, bone marrow and blood. The specialized functions of T lymphocytes are: 1) attack foreign directly antigens such as viruses, fungi, transplanted tissues 2) Act as regulators of the immune system. There are 3 types of t lymphocytes (killer or effector) destroyers T-lymphocyte = is set to your target and destroy it Support (helper) T cells = they help B lymphocytes produce antibodies and T cells help destroyers in the attack.

T-lymphocyte suppressors (suppressor) = they suppress or shut down to help T lymphocytes 3-phagocytes: phagocytes are specialized cells of the immune system whose primary function is to ingest or kill micro-organisms. Leukocytes (white blood cells) Act as single-celled organisms and are the second arm of the innate immune system. The innate leukocytes include the phagocytes (macrophages, neutrophils, and dendritic cells), mast cells, eosinophils, basophils, and natural killer cells. These cells identify and eliminate pathogens, well be attacking the larger ones through contact or encompassing others to kill them. Develop stem cells in the bone marrow. They migrate to all tissues of the body, but especially in the blood, spleen, liver, lymph nodes and lungs. Phagocytes serve different critical functions in the body against infections. Complement system-4: has 18 proteins that work orderly and integrated to help defend against infections and produce inflammation. The liver produces some of these proteins and certain phagocytes and macrophages produce others. Ingestion of micro-organisms by macrophages is much easier as covered of antibodies, complement, or both.

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