Effects of histamines on the body

Which cardiovascular effect is most commonly associated with histamine release during an allergic reaction?

Vasodilation leading to hypotension

How does histamine affect capillary permeability?

Increases it, leading to tissue swelling (edema)

What serious cardiac complication can result from widespread histamine release in anaphylaxis?

Myocardial infarction

Which respiratory symptoms are caused by histamine-induced bronchoconstriction? (Select all that apply)

Stridor, Wheezing, Dyspnea

What integumentary signs are commonly seen with histamine release?

Flushing, hives, angioedema

Which of the following best describes angioedema?

Deep tissue swelling, especially around face, lips, or eyes

Which gastrointestinal symptoms result from histamine activity?

Vomiting and diarrhea

Histamine can contribute to dizziness and fainting primarily due to:

Hypotension and fluid shifts

Besides systemic effects, histamine also increases:

Gastric acid secretion

What hormone is released in response to histamine that helps the body respond to stress?

Adrenaline (epinephrine)