Lecture 7 Immuno System B

Lecture 7 Immuno System B - Human Immune System The human...

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Immune S Human Immune System The human immune system is a truly amazing constellation of responses to attacks from outside the body. Immune S Immune S The constitutive defenses, by themselves, may not be sufficient to protect the host against pathogens. However, even if pathogens evade or overcome the relatively nonspecific constitutive defenses , they may yet be detected and attacked by the more specific inducible defenses , once they have developed. The inducible defenses are so-called because they are induced upon primary exposure to a pathogen or one of its products. The inducible defenses are a function of the immunological system and the immune responses . They must be triggered in a host and initially take time to develop. The type of resistance thus developed in the host is called acquired immunity . Inducible Defenses Immune S Active immunity is when the host undergoes an immunological response and produces the cells and factors responsible for the immunity, i.e., the host produces its own antibodies and/or immuno-reactive lymphocytes. Active immunity can persist a long time in the host, up to many years in humans. Passive immunity is acquisition by a host of immune factors which were produced in another animal, i.e., the host receives antibodies and/or
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