Question

3. How does a human body react to an allergen?​

Answer 1

Answer:

Explanation:

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.

Can you be allergic to human contact?

That name is dermatographia urticaria, usually just called dermatographia or dermographism (literally "writing on the skin"). It's a type of "trauma-induced urticaria," but the trauma in this case can be almost nothing—basically an allergic reaction to minimal physical stimulation.

What are the 4 types of allergic reactions?

Type I: Immediate Hypersensitivity (Anaphylactic Reaction) These allergic reactions are systemic or localized, as in allergic dermatitis (e.g., hives, wheal and erythema reactions). ...

Type II: Cytotoxic Reaction (Antibody-dependent) ...

Type III: Immune Complex Reaction. ...

Type IV: Cell-Mediated (Delayed Hypersensitivity)

Answer 2

Answer:

They are called allergens. During a reaction, your immune system releases antibodies. These are proteins that deliver a message to cells: Stop that substance! The cells then send out histamine, which causes blood vessels to expand, and other chemicals, and these trigger the allergy symptoms.