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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.
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Allergic contact dermatitis following skin contact with poison ivy would lead to what type of reaction?
Delayed hypersensitivity reaction.
What does a positive cell voltage mean?
The reaction is spontaneous.
What two types of reactions occur during photosynthesis?
The two reactions which occur during photosynthesis are light reaction and dark reaction. Light reaction takes place only in the presence of light. Dark reaction can occur with or without light.
Does photosynthesis occur only in the internal membranes of chloroplasts?
Dark reaction is in stroma.Light reaction in thylakoids.
What is present within the mitochondria that allows the reaction to occur?
Enzymes.
Which type of hypersensitivity reaction causes an asthma attack?
Type I hypersensitivity reaction http://en.wikipedia.org/wiki/Asthma
What occurs when the immune system mounts an exaggerated response to a harmless antigen?
hypersensitivity
Hay fever is a type of reaction?
Hypersensitivity
What causes delayed hypersensitivity reactions?
Allergens on the skin usually cause delayed hypersensitivity reaction.
What hypersensitivity reaction does not involve an antibody response?
Type IV
What are delayed hypersensitivity reactions?
Delayed hypersensitivity reactions-- Allergic reactions mediated by T cells that occur hours to days after exposure
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.
Is a transfusion reaction a subacute hypersensitivity to foreign red blood cells?
True.
What does hay fever and hives have in common?
they are all hypersensitivity reaction
What individual hypersensitivity to a substance usually antibody-antigen reaction is known as?
It is an allergy
What has the author Mariana C Castells written?
Mariana C. Castells has written: 'Anaphylaxis and hypersensitivity reactions' -- subject(s): Hypersensitivity, Anaphylaxis, Acute phase reaction, Clinical immunology, Allergy, Acute-Phase Reaction
What is antigen hypersensitivity?
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.
