The immune system protects against disease by identifying and killing pathogens and tumor cells. From viruses to parasitic worms, the immune system can detect anything. Bacteria, a simple unicellular organism possess enzyme systems that protect against all kinds of infections. The immune systems in humans contain many different types of proteins, cells, organs, and tissues, which are all included in a work.
The immune response is a protective response of the body's immune system to an antigen, especially a microorganism or a virus that causes disease. It will involve the action of lymphocytes that will turn off the antigens by stimulating the production of antibodies, or by a direct attack on other cells that are found in the body. These will often result in all different types of diseases.
The immune system contains many types of disorders, which can cause extreme diseases. One disease is called Immunodeficiency, which can occur when the system is less active. This type of disease can either be resulted of genetic disorders, or be produced through an infection. Another disease is called AIDS [acquired immune deficiency syndrome] which is caused by the retrovirus HIV. Retrovirus HIV is a condition in humans in which the immune system begins to fail, leaving to life-threatening infections.
Both innate and adaptive immunity depends on the ability of the immune system to show the difference between self and non-self molecules. Components of the innate immune system conclude that the response is non-specific, exposure leads to immediate maximal response, cell-mediated and humoral components, no immunological memory, and it is found in nearly all forms of life. Components of the adaptive immune system are composed of pathogen and antigen specific response, lag time between exposure and maximal response, cell-mediated and humoral components, exposure leads to immunological memory, and it is found only in jawed vertebrates.