19 Facts About Immune system

Immune system is a network of biological processes that protects an organism from diseases.

The innate immune system provides a preconfigured response to broad groups of situations and stimuli.

The adaptive immune system provides a tailored response to each stimulus by learning to recognize molecules it has previously encountered.

Immunodeficiency occurs when the immune system is less active than normal, resulting in recurring and life-threatening infections.

Autoimmunity results from a hyperactive immune system attacking normal tissues as if they were foreign organisms.

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Immune system protects its host from infection with layered defenses of increasing specificity.

The innate immune system is the dominant system of host defense in most organisms, and the only one in plants.

Cells in the innate immune system have pattern recognition receptors, which detect infection or cell damage, inside.

Complement Immune system is a biochemical cascade that attacks the surfaces of foreign cells.

Adaptive immune system evolved in early vertebrates and allows for a stronger immune response as well as immunological memory, where each pathogen is "remembered" by a signature antigen.

Cells of the adaptive immune system are special types of leukocytes, called lymphocytes.

Immune system is involved in many aspects of physiological regulation in the body.

The immune system plays a crucial role in embryogenesis, as well as in tissue repair and regeneration.

Immune system is affected by sleep and rest, and sleep deprivation is detrimental to immune function.

The ability of the immune system to respond to pathogens is diminished in both the young and the elderly, with immune responses beginning to decline at around 50 years of age due to immunosenescence.

Immune system complexes deposited in various tissues trigger Type III hypersensitivity reactions.

The principle behind vaccination is to introduce an antigen from a pathogen to stimulate the immune system and develop specific immunity against that particular pathogen without causing disease associated with that organism.

Some drugs can cause a neutralizing immune response, meaning that the immune system produces neutralizing antibodies that counteract the action of the drugs, particularly if the drugs are administered repeatedly, or in larger doses.

Prokaryotes possess acquired immunity, through a Immune system that uses CRISPR sequences to retain fragments of the genomes of phage that they have come into contact with in the past, which allows them to block virus replication through a form of RNA interference.