Final answer:
Anaphylaxis is a severe and potentially life-threatening type I hypersensitivity reaction. It can cause swelling, airway blockage, low blood pressure, and shock. Anaphylaxis is classified as a type I hypersensitivity, involving mast cells and IgE antibodies.
Step-by-step explanation:
Anaphylaxis is a systemic and potentially life-threatening type I hypersensitivity reaction. It is a severe allergic reaction that occurs rapidly after exposure to an allergen. Anaphylaxis can cause symptoms such as swelling of the tongue and trachea, blockage of airways, dangerous drop in blood pressure, and development of shock. It is classified as a type I hypersensitivity, which involves sensitization of mast cells with IgE antibodies.