IMMUNE SYSTEM

April 2010

OBJECTIVES SWBAT explain the cause of infectious

disease and identify the organisms that cause diseases

SWBAT describe how pathogens enter the body

DO NOW: Brainstorm a list of familiar diseases.

divide list into those that you think can be spread from one person to another and those that can’t.

ACTIVITY Shake hands with three people. Each person shakes with three more, and

so on

How does the apple skin protect it?

DISEASE AND PATHOGENS Organisms that cause disease are

called pathogens

Infectious disease can be spread from one organism to another

FOUR PATHOGENS

Bacteria – one celled organisms. Ex. Strep, ear infections, pneumonia

Virus- tiny particles which cannot reproduce on their own. Must live in another cell – living or not living questionable. Cells damaged, ex cold and flu. Chicken pox and aids

Fungi – molds yeasts etc – athletes foot, yeast infection thrush

Protists- protists cause malaria

BACTERIA – ONE CELLED ORGANISMS. EX. STREP, EAR INFECTIONS, PNEUMONIA

Virus- tiny particles which cannot reproduce on their own. Must live in another cell – living or not living questionable. Cells damaged, ex cold and flu. Chicken pox and aids

FUNGI – molds yeasts etc – athletes foot, yeast infection thrush

Click icon to add picture

HOW DISEASES SPREAD You can get pathogens from other people contaminated objects animal or insect bite Environment

www.kidshealth.org

OBJECTIVE: SWBAT DESCRIBE HOW THE BODY DEFENDS ITSELF AGAINST PATHOGENS

DO NOW: Copy Homework:

Finish p 170-176 questions (per 7)Finish immune dialogueTest Friday – Reproductive, Immune,

Endocrine systems

Hand in old work p 170-176 questions

OBJECTIVE: SWBAT DESCRIBE HOW THE BODY DEFENDS ITSELF AGAINST PATHOGENS

LEVEL 1 RESPONSE: KEEP OUT!Most pathogens are trapped on the way

into the body by the

Skin breathing passages mouthstomach tears

OBJECTIVE: SWBAT DESCRIBE HOW THE BODY DEFENDS ITSELF AGAINST PATHOGENS

LEVEL 2 RESPONSE: INFLAMMATORY RESPONSEFluid and blood cells leak from blood vessels into

nearby tissues. The white blood cells then fight the pathogens.

Phagocytes are a type of white blood cell that engulfs or eats pathogens. They are NOT specific to the type of pathogen.

As blood leaks into the area it gets red and hot and swollen. Inflammation – “flamed”

Fever

OBJECTIVE: SWBAT DESCRIBE HOW THE BODY DEFENDS ITSELF AGAINST PATHOGENS

LEVEL 3 RESPONSE: IMMUNE RESPONSE Cells can distinguish between different kinds of

pathogens and respond with a targeted cell. Lymphocytes - white blood cells which

are specific to pathogen

T-cells: Tag and identify pathogen and call for help. Also destroy infected body cells

B-cells: Make antiBodies which fit to specific antigen and make virus clump up to be destroyed by phagocytes

OBJECTIVE: SWBAT DESCRIBE HOW THE BODY DEFENDS ITSELF AGAINST PATHOGENS

LEVEL 3 RESPONSE: IMMUNE RESPONSE Memory cells: remember and recognize

pathogen to make immune response for next time invader comes around.

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