What effect does anaphylaxis have on the body?

• A. Elimination of pain
• B. Increased heart rate
• C. Severe constriction of airways
• D. Dilation of blood vessels

Answer: (C)

Anaphylaxis is a severe and potentially life-threatening allergic reaction that activates the body's immune response, leading to a variety of physiological changes. One of the hallmark effects of anaphylaxis is severe constriction of the airways, which occurs due to the release of histamines and other chemicals from mast cells and basophils. This bronchoconstriction can significantly hinder a person's ability to breathe, leading to wheezing, stridor, and respiratory distress.

Additionally, the swelling of the throat and tongue can occur, exacerbating the difficulty in breathing during anaphylaxis. This airway constriction is a critical symptom that requires immediate medical intervention, typically involving the administration of epinephrine to counteract the reaction and open the airways.

The other options reflect various physiological responses associated with anaphylaxis but do not encapsulate the most crucial effect on the respiratory system as severe constriction of the airways does. Understanding this aspect is vital for EMTs and responders in recognizing and managing anaphylactic reactions effectively.