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What is the Immune System?

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Complete antigens possess both immunogenicity and reactivity.

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Related Experiment Video

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Target pattern recognition in innate immunity. Foreword

Kenneth B M Reid¹

¹Department of Biochemistry, University of Oxford, Oxford, UK.

Advances in Experimental Medicine and Biology

|October 6, 2009

Summary

No abstract available in PubMed .

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