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Immunity part 2

Immunity, Science 30, Bio

QuestionAnswer
Pathogen An agent, especially a virus or bacterium that causes disease.
Skin -Protective barrier -First line of defence -Analogy: Thick stone walls of a fortress
Nasal Passage(filters) Mucous Secretions(trap) -First line of defence - prevent pathogen entry -trap pathogen -Analogy: Castle door
Tears Stomach Acid -First line of defence -prevent entry by destruction -Analogy:Archer
Platelets -2nd line defence -clot and repair damage to skin to keep out invaders -Analogy:Stonemason
White Blood Cells (WBC) -army of cell soldiers that attack invaders -Analogy:Knights
Droplet Infection inhaling infected droplets expelled from a sick person lungs
Vectors organisms that5 carry pathogens from one organism to another(ex.malaria by mosquito to human)
Antiseptics -soloution that prevents or stops micro-organisms growth LISTER!!!!
Improper use of antibiotics can lead to... ANTIBIOTIC RESISTANCE!
Virus - non-cellular particle consistince of protein coated with genetic material -multiplies only within the cells of a living organism
How a virus infects a cell: 1. virus attaches to host cell 2.genetic material injected into host cell attacks nucleus 3.cell used to make new virus part 4.virus assembled 5. new viruses free to infect other cells
Antigen allow wbc's to recognize foreign invaders
macrophage -destroy/engulf invaders -eat them up
helper t-cells identify antigens of foreign invaders and signal response of B-cells and killer t-cells
B-cells produce antibodies
antibody attach to antigen of foreign material
Rheumatoid Arthiriis -attacks joints -WBC attack joints & bones of the hand
Inflammatory bowel disease -immune system attacks lining of digestive track -group of inflamatory conditions of the colon and small intestine
MS ???
Lupus immune system attack body/organs -symptoms vary widely per persom
Created by: Skyerene
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