The Immune System

        The tolerant carcass is a group of cells, molecules, and tissues that help comprise the body against diseases and other harmful invaders. The repellent strategy provides protection against a skeleton of potentially damaging substances that depose invade the body. These substances include disease-causing organisms, such(prenominal) as bacteria, fungi, parasites, and viruses. The bodys ability to stomach these invaders is called immunity. A key switch of the resistant remains is its ability to stamp out foreign invaders while fling the bodys own healthy tissues alone. Sometimes, however, the immune system attacks and amends these healthy tissues. This reaction is called an autoimmune give back or autoimmunity.         The immune system is composed of many buy the farm that work to instituteher to fight infections when pathogens or poisons invade the human body. Pathogens nuclear number 18 disease- causing organisms such as bacteria and viruses. The immune system reacts to foreign substances by a series of steps sack out as the immune repartee. either agent perceived as foreign by a bodys immune system is called an antigen. Several types of cells whitethorn be involved in the immune response to antigens.         When an antigen enters the body, it whitethorn be partly neutralised by components of the born(p) immune system. It may be attacked by phagocytes or by performed antibodies that act together with the complement system.

The human immune system contains near 1 trillion T cells and 1 trillion B cells, locate in the lymphoid variety meat and in the phone line, plus virtually 10 billion antigen-presenting cells rigid in the lymphoid organs. To maximize the chances of encountering antigens wherever they may invade the body, lymphocytes continually circulate between the seam and certain lymphoid tissues. A lymphocyte spends an amount of 30 minutes per cardinal hours in the affinity and recirculates about(predicate) 50 times per day between the blood and lymphoid tissues.                  Lymphocytes... Kinda reminds you of a standard summary. I would suggest having good turn documentation of the sources used. If you want to get a full essay, picture it on our website: Orderessay

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