Did you know? We have 10 times more bacteria cells in our bodies than human cells.

Did you know? We have 10 times more bacteria cells in our bodies than human cells.Immune SystemPurpose: to protect our bodies from infection and pathogensPathogens: Disease-causing agentsImmune SystemOur body has several types of defenses against pathogens

Types of PathogensTravel with your table to 4 stations around the roomTake notes in the provided graphic organizerBacteriaVirusesParasitesFungiBacteriaSingle-celled organismsRelease chemicals that are toxic to the host which destroys healthy body cellsExamples: food poisoning, tuberculosis, syphilis

VirusesStrands of DNA or RNA surrounded by a protein coatTake over a healthy cell and cause it to produce more virusesExamples: HIV, flu, herpes

FungiMulti-cellular organisms (except for yeast) Pierce healthy cells and take the cells nutrientsExamples: Athletes foot, pneumonia

ParasitesOrganisms that grow and feed on their hostSome kill while others drain the bodys resourcesExamples: Tapeworms, Malaria, Scabies

How Your Body Protects ItselfSkinProtective layer for organsSecretes sweat, making it acidic and harmful for pathogensMucous membranesLines all openings in the body (eyes, nose, mouth, ears, etc.)Traps pathogens in cilia (tiny hair like structures) before they enter the body

How Your Body Fights BackWhite blood cells: Find and kill pathogens that have made it past the skin and mucous membranesPhagocytes: engulf pathogens to destroy themT cells: destroy body cells already infected with the pathogenB cells: produce proteins that inactivate pathogens that have yet to infect other cells

How Your Body Fights BackProteinsAntibody: Proteins made by B cells that attack pathogens in actionImmunity: Failure to get sick in the presence of a pathogenPassive: occurs by immunity being passed down from mother to childActive: happens after body has successfully responded to a pathogen before

How Your Body RespondsOccurs when pathogen enters the body or tissue gets damagedInflammationBody rushes blood to the site to provide WBCs Results in swelling, redness, pain, itching and increased warmth at the site

Overreactions of the Immune SystemAllergy: An oversensitivity to a harmless antigenAutoimmune disease: Immune system cannot tell the difference between healthy and unhealthy body cellsExamples: Type 1 Diabetes, Multiple Sclerosis

How Your Body RespondsFeverChemicals are released to increase body temperature, which helps WBCs mature faster High fevers are dangerous because they denature enzymes that are vital to the body

MedicationAntibioticsTarget bacteria or fungi and keep them from growing or reproducingAntibiotic resistance occurs when bacteria mutate so that they are no longer affected by antibiotics

MedicationVaccinesSubstance that contains the antigen (antibody producer) of a pathogen Body produces necessary defenses without getting sick

HIV/AIDShttps://www.youtube.com/watch?v=-7CdQOuc3vQHIVRead the back of your graphic organizerAIDSAcquired Immunodeficiency SyndromeThe DifferenceHIV is a virusAIDS is the final result of HIV