could someone explain the immune system in laymens terms.?

Question

for a report and i keep getting server blocked on the sites i try to pull up

Answer 1

Your immune system is a group of organs and cells that's functions is to fight bacteria to keep you from getting sick. So you can think of it as the things that block infection from our bodies. Like our skin and mucus membranes. They are there to protect us and to fight bacteria from getting into our bodies. Mucus membranes are in your nose, mouth, eyes, and urinary tract system. This is why you sneeze, cough or your eyes may tear up. It's all acts to get whatever foreign body trying to get in - out!

The T-Cell is one of the most important elements in the human Immune System. Its role in directly destroying infected or Cancerous cells is great. This is why the threat of HIV/AIDS is so huge. The virus attached the T-cells leaving the body defensless against infection.

Answer 2

From what I know, it's the part of your body that rejects the things that are bad for you. For instance, if there is bacteria in something you eat, your immune system, if working properly, should be able to fight off the bacteria, and the contaminated food should not get you severely sick.

Answer 3

The immune system is term for the body's overall capacity to fight off new diseases attacking it and is system that allows body to recover from infections.
People with organ transplants take medication to compromise the immune system so they do not reject the transplanted organ.

Answer 4

Inside your blood are antibodies which attack any germs and bacteria and help to keep us healthy. If we don't have a healthy diet or we have a disease which prevents the blood from producing these, we tend to find it hard to fight off sickness. The immune system is like the anti-virus installed in your computer.

Answer 5

the immune system is a system inside the body that fights off sickness.

Answer 6

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Answer 7

http://en.wikipedia.org/wiki/Immune_system

A set of mechanisms that protect an organism from infection by identifying and killing pathogens.

Answer 8

Use Wikipedia. There is no reason for blocking that.

If you can't here is almost the entire page in the following:
The immune system is a set of mechanisms that protect an organism from infection by identifying and killing pathogens. This task is extremely difficult, since pathogens range from viruses to parasitic worms and these diverse threats must be detected with absolute specificity amongst normal cells and tissues. Pathogens are also constantly evolving new ways to avoid detection by the immune system and successfully infect their hosts.

To meet this challenge, multiple mechanisms have evolved to recognize and neutralize pathogens. Even simple unicellular organisms such as bacteria possess enzyme systems that protect against viral infections. Other basic immune mechanisms evolved in ancient eukaryotes and remain in their modern descendants, such as plants, fish, reptiles, and insects. These mechanisms include antimicrobial peptides called defensins, pattern recognition receptors, and the complement system. More sophisticated mechanisms, however, developed relatively recently, with the evolution of vertebrates.[1] The immune systems of vertebrates such as humans consist of many types of proteins, cells, organs, and tissues, which interact in an elaborate and dynamic network. As part of this more complex immune response, the vertebrate system adapts over time to recognize particular pathogens more efficiently. The adaptation process creates immunological memories and allows even more effective protection during future encounters with these pathogens. This process of acquired immunity is the basis of vaccination.

Disorders in the immune system can cause disease. Immunodeficiency diseases occur when the immune system is less active than normal, resulting in recurring and life-threatening infections. Immunodeficiency can either be the result of a genetic disease, such as severe combined immunodeficiency, or be produced by pharmaceuticals or an infection, such as the acquired immune deficiency syndrome (AIDS) that is caused by the retrovirus HIV. In contrast, autoimmune diseases result from a hyperactive immune system attacking normal tissues as if they were foreign organisms. Common autoimmune diseases include rheumatoid arthritis, diabetes mellitus type 1 and lupus erythematosus. These critical roles of immunology in human health and disease are areas of intense scientific study.

The immune system protects organisms from infection with layered defenses of increasing specificity. Most simply, physical barriers prevent pathogens such as bacteria and viruses from entering the body. If a pathogen breaches these barriers, the innate immune system provides an immediate, but non-specific response. Innate immune systems are found in all plants and animals.[2] However, if pathogens successfully evade the innate response, vertebrates possess a third layer of protection, the adaptive immune system. Here, the immune system adapts its response during an infection to improve its recognition of the pathogen. This improved response is then retained after the pathogen has been eliminated, in the form of an immunological memory, and allows the adaptive immune system to mount faster and stronger attacks each time this pathogen is encountered.[3]

Both innate and adaptive immunity depend on the ability of the immune system to distinguish between self and non-self molecules. In immunology, self molecules are those components of an organism's body that can be distinguished from foreign substances by the immune system.[4] Conversely, non-self molecules are those recognized as foreign molecules. One class of non-self molecules are called antigens (short for antibody generators) and are defined as substances that bind to specific immune receptors and elicit an immune response.[5]

Surface barriers
Several types of barriers protect organisms from infection, including mechanical, chemical and biological barriers. The waxy cuticle of a leaf, the exoskeleton of an insect, the shell of an egg, and the skin are examples of the mechanical barriers that are the first line of defence against infection.[5] However, as organisms cannot be completely sealed, other systems act to protect body openings such as the lungs and the genitourinary tract. In the lungs, coughing and sneezing mechanically eject pathogens and other irritants from the respiratory tract. The flushing action of tears and urine also mechanically expels pathogens, while mucus secreted by the respiratory and gastrointestinal tract serves to trap microorganisms.[6]

Chemical barriers also protect against infection. The skin and respiratory tract secrete antimicrobial peptides such as the β-defensins.[7] Enzymes such as lysozyme and phospholipase A in saliva, tears, and breast milk are also antibacterials.[8][9] Vaginal secretions serve as a chemical barrier following menarche, when they become slightly acidic, while semen contains defensins and zinc to kill pathogens.[10][11] In the stomach, gastric acid, and proteases serve as powerful chemical defenses against ingested pathogens.

Within the genitourinary and gastrointestinal tracts, commensal flora serve as biological barriers by competing with pathogenic bacteria for food and space and, in some cases, by changing the conditions in their environment, such as pH.[12] This reduces the probability that pathogens will be able to reach sufficient numbers to cause illness. However, since antibiotics do not discriminate between pathogenic bacteria and the normal flora, oral antibiotics can sometimes lead to an “overgrowth” of fungus (fungus is not affected by antibiotics), such as a vaginal yeast infection.[13] Re-introduction of probiotic flora, such as lactobacilli found in yoghurt, can help to restore a healthy balance of microbial populations.[14]