Allergies represent a type I hypersensitivity reaction involving mast cells and histamine release. Anaphylactic shock can be fatal if untreated but requires epinephrine for treatment.
Allergies are a type II hypersensitivity reaction. This statement is not true as allergies are actually a type I hypersensitivity reaction (immediate hypersensitivity). In allergic reactions, antibodies mediate the immune response within minutes of exposure to allergens, not through type II hypersensitivity. Allergies involve mast cells releasing histamine upon exposure to allergens, not mast cell granules causing vasoactive effects. Severe allergies can lead to anaphylactic shock, which can be fatal within 20 to 30 minutes if untreated. Mild allergies are commonly treated with antihistamines, but anaphylactic shock requires immediate epinephrine injection to counteract the life-threatening effects.
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