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Allergies occur when the immune system responds to________.a. pathogensb. toxinsc. normally harmless substancesd. all of the above
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Allergies are an overreaction of the immune system to substances that are usually harmless. Show more…
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Allergies occur when the body responds to __________. a. pathogens b. toxins c. normally harmless substances d. all of the above
Allergens a. cause an immune response in most people. b. are antigens to those people who are allergic to them. c. reduce the production of histamine by mast cells. d. are molecules that are usually rare in the environment.
Substances which cause allergy are known as (a) Mutagens (b) Irritants (c) Allergens (d) Agglutinogens
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