The study of the body's immune system.

Also known as hives.

An exaggerated immune response.

Which in not a chemical released by the immune system during an allergic reaction?

An extreme allergic reaction that is life threatening and involves multiple organ systems.

Most common sign of anaphylaxis is

During anaphylaxis, hypotension may result from hypovolemic shock due to increased capillary permeability.

A substance that triggers the body's immune response and causes an allergic reaction.

A sting.

Usually injected medications may cause an allergic reaction in the first 5 minutes.

After you have taken a medication once without an allergic reaction, it is unlikely you will have an allergic reaction ever again.

A honeybee leaves part of its abdomen embedded with the stinger in the skin and dies shortly after stinging.