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The four types of hypersensitivity reactions are classified as localized reactions: Type I (IgE-mediated) involves allergens triggering immediate allergic responses, such as hay fever or Asthma. Type II (cytotoxic) reactions occur when antibodies target specific cells, leading to conditions like hemolytic anemia. Type III (immune complex-mediated) reactions involve the formation of immune complexes that can cause localized inflammation, seen in conditions like arthus reaction. Type IV (delayed-type) reactions are mediated by T cells and can lead to localized dermatitis or granuloma formation, typically occurring hours to days after exposure.
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Is a transfusion reaction a subacute hypersensitivity to foreign red blood cells?
A transfusion reaction is typically an acute hypersensitivity reaction to foreign red blood cells, which can occur immediately or within a few hours of the transfusion. Subacute hypersensitivity reactions usually take days to develop after exposure to the antigen, unlike the immediate onset of symptoms seen in transfusion reactions.
What is the hypersensitive reaction to a substance?
Hypersensitivity reaction is an exaggerated immune response to a substance that is usually harmless to most people, such as pollen, certain foods, or medications. This response can lead to symptoms ranging from mild irritation to severe allergic reactions.
What are the products of combustion reactions?
Usually Water and Carbon Dioxide.
Are tsunamis a localized weather phenomenon?
No, tsunamis are not a localized weather phenomenon. They are large ocean waves usually caused by underwater earthquakes, volcanic eruptions, or landslides. Tsunamis can travel across entire ocean basins and affect coastlines thousands of miles away from their source.
What Are 4 types of chemical reactions?
Chemical reactions are those that involve a chemical change and the products are usually different from the reactants. Such reactions are Decomposition, Synthesis, Single displacement and Double displacement.
What causes immediate hypersensitivity reactions?
Inhaled or ingested allergens usually cause immediate hypersensitivity reactions.
What causes delayed hypersensitivity reactions?
Delayed hypersensitivity reactions, also known as type IV hypersensitivity reactions, are caused by T cells recognizing antigens and triggering an immune response. This can happen hours to days after exposure to the antigen. Common triggers include certain drugs, metals, and infectious agents.
Is a transfusion reaction a subacute hypersensitivity to foreign red blood cells?
A transfusion reaction is typically an acute hypersensitivity reaction to foreign red blood cells, which can occur immediately or within a few hours of the transfusion. Subacute hypersensitivity reactions usually take days to develop after exposure to the antigen, unlike the immediate onset of symptoms seen in transfusion reactions.
What individual hypersensitivity to a substance usually antibody-antigen reaction is known as?
It is an allergy
What is the hypersensitive reaction to a substance?
Hypersensitivity reaction is an exaggerated immune response to a substance that is usually harmless to most people, such as pollen, certain foods, or medications. This response can lead to symptoms ranging from mild irritation to severe allergic reactions.
What are stars usually classified by?
They are usually classified by their temperature.
What is bird keeper's lung?
The technical name for it is Hypersensitivity pneumonitis which is an "inflammation of the lungs due to breathing in a foreign substance, usually certain types of dust, fungus, or molds." https://health.google.com/health/ref/Hypersensitivity+pneumonitis
In the body decomposition reactions are usually?
These reactions are called catabolic.
How are engineering materials classified?
the material usually classified based on their properties.
What is an African violet classified as?
Usually African violets are classified as flowering indoor houseplants.
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 are considered Favorable chemical reactions?
Favorable chemical reactions are those that release energy, produce a decrease in entropy, or result in the formation of more stable products. These reactions typically proceed in the direction of equilibrium and are thermodynamically spontaneous. Examples include combustion reactions and exothermic reactions.
