Which are the chemicals in the body that cause the symptoms of an allergic reaction? a. antibodies b. histamines c. allergens d. antihistamines

The antibodies remain in the blood- stream after the antigen is removed. The IgE antibodies are responsible for many of the most common allergic reactions such as hay fever, asthma, anaphylaxis, hives and eczema.

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which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.