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ShareThe immune system is the system of specialized cells and organs that protect an organism from outside biological influences.
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(Though in a broad sense, almost every organ has a protective function - for example, the tight seal of the skin or the acidic environment of the stomach.) When the immune system is functioning properly, it protects the body against bacteria and viral infections, destroying cancer cells and foreign substances.
If the immune system weakens, its ability to defend the body also weakens, allowing pathogens, including viruses that cause common colds and flu, to grow and flourish in the body.
The immune system also performs surveillance of tumor cells, and immune suppression has been reported to increase the risk of certain types of cancer.
For more information about the topic Immune system, read the full article at Wikipedia.org, or see the following related articles:
White blood cell — White blood cells (also called leukocytes or immune cells) are cells which form a component of the blood. They help to defend the body against ... > read more
Pathogen — A pathogen or infectious agent is a biological agent that causes disease or illness to its host. The term is most often used for agents that disrupt ... > read more
Skin — In zootomy and dermatology, skin is an organ of the integumentary system composed of a layer of tissues that protect underlying muscles and organs. ... > read more
Human physiology — Human physiology is the science of the mechanical, physical, and biochemical functions of normal humans or human tissues or organs. The principal ... > read moreEditor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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