A10-year-old boy has been brought to the emergency department (ed) by ambulance in apparent anaphylaxis after accidentally eating a snack bar that contained peanuts. the ed nurse should be aware that this patient's signs and symptoms are attributable to:

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.

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.

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