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Hypersensitivity describes associate abnormal or pathologic reaction that's caused by associate immunologic response to perennial exposure to associate matter. Hypersensitivity diseases embrace response diseases, during which immune responses area unit directed against self-antigens, AND diseases that result from uncontrolled or excessive responses to foreign antigens. as a result of these reactions tend to occur against antigens that can't be loose (i.e. self-antigens) and since of regeneration systems intrinsic to numerous aspects of the immunologic response, hypersensitivity diseases tend to manifest as chronic issues.
Wiki User
∙ 8y ago
Wiki User
∙ 10y agoThis question requires a complex answer. The following is an oversimplification.
An antigen is a substance which causes the body to create an immune response. That is, having once contacted the substance the body builds up a resistance to its effect. Vaccines are based on this. They give you a mild introduction to the antigen and your body builds up an immunity to it such that when you are exposed to it later is has no reaction or a reduced reaction. A hypersensitivity response is when the immune system overreacts to the antigen and does destructive things to organs that can be minor or cause death.
There are four types of antigen hypersensitivity responses that operate in different was on the body.
Wiki User
∙ 13y agoImmune hypersensitivity reaction-- Allergic reactions that are mediated by mast cells and occur within minutes of allergen contact.
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What is the definition of an Anaphylaxis?
Hypersensitivity to a second dose of antigen.
What occurs when the immune system mounts an exaggerated response to a harmless antigen?
hypersensitivity
What individual hypersensitivity to a substance usually antibody-antigen reaction is known as?
It is an allergy
What is an Arthus reaction?
An Arthus reaction is a hypersensitivity reaction involving the in situ formation of antigen/antibody complexes after the intradermal injection of an antigen.
Which term describes an exaggerated life threatening hypersensitivity reaction to a previously encountered antigen?
anaphylaxis
How is histamine related to allergies?
An allergy is a hypersensitivity to an environmental antigen (allergen). If a person has a hypersensitivity to an antigen they will have a patholigic (disease) response when exposed to that antigen. When the hypersensitive individual is initially exposed to the antigen, they will produce allergen specific antibodies, primarily immunoglobulin E (IgE), that will during subsequent exposures bond with membrane proteins on the mast cell membrane. This bonding allows degranulation (the release of stored chemicals) of the mast cell. Mast cells manufacture and store chemicals, including histamine, that are responsible for the affects of inflamation.
The initial exposure to an antigen is called?
Some more context would be helpful. This question sounds like it may be asking about antigen exposure in the field of allergic disease, but it's hard to be sure. Hypersensitivity reactions (the immune system basis for allergies) are based on the principle that allergy follows initial sensitization to an antigen.
When does a hypersensitivity reaction occur?
Hypersensitivity is when a person's immune system over-reacts to an antigen. This usually occurs in the context of allergies, when a person develops a runny nose, itchy watery eye, sneezing and coughing due to pollen or mold in the air. A more serious form of hypersensitivity reaction is anaphylactic shock, when the throat swells shut and a person cannot breathe; this is usually in response to a severe allergic reaction such as to peanut butter, bee stings or other antigens.
What is the accented syllable for Hypersensitivity?
The accented syllable in "Hypersensitivity" is "-sen-".
Which type hypersensitivity is called delayed hypersensitivity?
Type IV Hyper sensitivity. AKA delayed hypersensitivity. Can be classified into: -contact -tuberculin -granuloma
What is photophopia?
hypersensitivity to light :) People with migraines have this, as well as phonophopia (hypersensitivity to sound).
Which of the following is not an antigen that may be found on the surface of an erythrocyte a A antigen b B antigen c O antigen d Rh antigen?
A antigen
