The right answer is A massive release of histamine.
Anaphylactic shock is an immediate, severe and generalized allergic reaction that affects the body as a whole. It requires emergency treatment.
Anaphylactic shock may occur, for example, following a bite of a hymenopteran (bee), or if the drug-sensitive individual is injected with this allergen into the blood (eg, penicillin) or if ingests a food to which he is allergic.
In anaphylactic shock, a large number of mast cells and basophilic granulocytes release histamine in different areas of the body. The outcome can be fatal.
The symptoms appear very quickly; they include demonstrations:
Cutaneous: itching, swelling;
Respiratory: bronchioles tighten, breathing is difficult;
Digestive: nausea, vomiting, abdominal pain;
Cardiovascular: tachycardia, drop in blood pressure.
* Adrenaline (vasoconstrictor) and a bronchodilator should be used to control these serious effects of histamine.