The Immune System

        The tolerant carcass is a group of cells, molecules, and tissues that help epitomise the body against diseases and other harmful invaders. The tolerant outline provides protection against a pee-pee of potentially damaging substances that peck invade the body. These substances include disease-causing organisms, much(prenominal) as bacteria, fungi, parasites, and viruses. The bodys ability to remain firm these invaders is called immunity. A key work of the insubordinate frame is its ability to extirpate foreign invaders while crack the bodys own healthy tissues alone. Sometimes, however, the resistant system attacks and indemnity these healthy tissues. This reaction is called an autoimmune sideboard or autoimmunity.         The immune system is composed of many function that work unitedly 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 recognize as the immune repartee. some(prenominal) 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 alter by components of the born(p) immune system. It may be attacked by phagocytes or by performed antibodies that act to vexher 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 well-nigh 10 billion antigen-presenting cells situated in the lymphoid organs. To maximize the chances of encountering antigens wherever they may invade the body, lymphocytes continually circulate between the melody and certain lymphoid tissues. A lymphocyte spends an intermediate of 30 minutes per 24 hours in the snag and recirculates roughly 50 times per day between the blood and lymphoid tissues.                  Lymphocytes... Kinda reminds you of a textual matter summary. I would suggest having round documentation of the sources used. If you want to get a full essay, cause it on our website: Ordercustompaper.com

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