AP BIOLOGY

Detailed explanation-1: -When a harmless substance such as dust, mold, or pollen is encountered by a person who is allergic to that substance, the immune system may over react by producing antibodies that “attack” the allergen. The can cause wheezing, itching, runny nose, watery or itchy eyes, and other symptoms.

Detailed explanation-2: -An allergy is when your immune system reacts to something that is harmless to most people. Substances that cause allergies are called ‘allergens’. Common allergies include: food allergies (including fish and shellfish, nuts, eggs, wheat, dairy, soy)

Detailed explanation-3: -When you have allergies, your immune system makes antibodies that identify a particular allergen as harmful, even though it isn’t. When you come into contact with the allergen, your immune system’s reaction can inflame your skin, sinuses, airways or digestive system.

Detailed explanation-4: -An allergic reaction is an overreaction of the immune system to a substance called an allergen. Allergens include chemicals, foods, medicines, mould, plants, and pollen. Symptoms of an allergic reaction can range from mild and annoying to severe and life-threatening.

Detailed explanation-5: -An allergy is a disorder in which the immune system makes an inflammatory response to a harmless antigen. It occurs when the immune system is hypersensitive to an antigen in the environment that causes little or no response in most people.