Transcript Allergic reactions

Objective: Understand How Allergy Works
Key words: allergy, allergens, histamine, inflammatory response, antihistamines, mast cells
Do Now:
List 3 things you already know about allergies.
Objective: Understand How Allergy Works
Key words: allergy, allergens, histamine, inflammatory response, antihistamines, mast cells
What is an Allergy?
A rapid overeaction to an antigen that is not normally harmful
Allergens: substances that cause allergic reactions.
Examples
Pollen
Insect sting
Body cells
release
Certain food
Animal hair
HISTAMINE
Dust
Mold
INFLAMMATORY
RESPONSE
SYMPTOMS
runny nose
swollen eyes
wheezing
rash
Antihistamines: drugs used to counteract the effects of histamine
coughing
Objective: Understand How Allergy Works
Key words: allergy, allergens, histamine, inflammatory response, antihistamines, mast cells
Mast Cells and the Allergic Response
Objective: Understand How Allergy Works
Key words: allergy, allergens, histamine, inflammatory response, antihistamines, mast cells
Allergy Reading
The immune system helps maintain the internal dynamic equilibrium necessary for life. However, the
immune system can become out of balance.
Allergic reactions result form over activity of the immune system. The body responds inappropriately
to common substances such as dust, mold, pollen, or certain foods. Antigens that cause allergic
reactions are called allergens.
The immune system begins making a special type of antibody to these substances, which under normal
conditions would not stimulate the immune system.
These antibodies cause cells in the body to release histamines, which cause many allergic symptoms,
such as extra fluid in the nasal pathways, difficulty breathing, or inflammation. Allergies are often
treated with antihistamines, drugs that stop the release of histamine.
Some allergic reactions can create a dangerous condition called asthma. Asthma is a chronic
respiratory disease in which the air passage become narrower than normal.
This narrowing of the air passage causes wheezing, coughing, and difficulty in breathing. Many factors,
including both heredity and environment, play a role in the onset of the symptoms of asthma.
Asthma attacks can be triggered by respiratory infections, exercise, emotional stress, and certain
medications, cold air, pollen, dust, tobacco smoke, pollution, etc..
Objective: Understand How Allergy Works
Key words: allergy, allergens, histamine, inflammatory response, antihistamines, mast cells
Symptoms of an Allergic Reaction
Objective: Understand How Allergy Works
Key words: allergy, allergens, histamine, inflammatory response, antihistamines, mast cells
Allergy Chart
What is allergy?
Example of allergens
A rapid overraction to an antigen that is not
normally harmful
Pollen, Mold, Dust, Certain food, Animal hair
How does body respond
to allergens?
The body cells release histamines, which cause an
inflammatory response and many allergic symptoms
Allergic symptoms
runny nose, swollen eyes, wheezing, rash, coughing,
itching
Example of allergy?
Asthma
Objective: Understand How Allergy Works
Key words: allergy, allergens, histamine, inflammatory response, antihistamines, mast cells
Allergy Chart
Allergic symptoms
Example of allergens
What is an allergy?
Example of allergies
How body responds
to allergens?