Final answer:
Anaphylaxis is a severe allergic reaction characterized by airway swelling and dilation of blood vessels. It is a life-threatening response caused by a massive release of histamines. Epinephrine is used for treatment.
Step-by-step explanation:
Anaphylaxis is the severe allergic reaction characterized by airway swelling and dilation of blood vessels all over the body that occurs within 30 minutes. It is a life-threatening response caused by a massive release of histamines. Some of the symptoms include a drop in blood pressure, changes in heart rate, shortness of breath, and swelling of the tongue and throat. Epinephrine is used to control the immune reaction and can be lifesaving. Individuals with known severe allergies are encouraged to carry automatic epinephrine injectors with them at all times.