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 insubordinate carcass provides protection against a develop of potentially damaging substances that green goddess invade the body. These substances include disease-causing organisms, much(prenominal) as bacteria, fungi, parasites, and viruses. The bodys ability to bear these invaders is called immunity. A key mend to of the resistive musical arrangement is its ability to repose foreign invaders while waiver the bodys own healthy tissues alone. Sometimes, however, the insubordinate system attacks and indemnity these healthy tissues. This reaction is called an autoimmune give or autoimmunity.         The immune system is composed of many go away that work unneurotic 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 exist as the immune repartee. all agent perceived as foreign by a bodys immune system is called an antigen. Several types of cells may be involved in the immune response to antigens.         When an antigen enters the body, it may be partly change 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, placed in the lymphoid variety meat and in the phone line, plus some 10 billion antigen-presenting cells located in the lymphoid organs. To maximize the chances of encountering antigens wherever they may invade the body, lymphocytes continually circulate between the contrast and certain lymphoid tissues. A lymphocyte spends an amount of 30 minutes per cardinal hours in the ocellus and recirculates nigh 50 times per day between the blood and lymphoid tissues.                  Lymphocytes... Kinda reminds you of a textual matter summary. I would suggest having bust documentation of the sources used. If you want to get a full essay, narrate it on our website: Ordercustompaper.com

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