The Immune System

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by Ellie14493
Last updated 4 years ago

Human Anatomy

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The Immune System

First Layer of Defense: Prevents Pathogens' Entry

Second Layer of Defence: Non-specific Destruction of Pathogens

Inflammatory Response!!-begins when the skin is broken-basophils stimulate the release of histamines, which cause which cause the capillaries to dilate, allowing fluids and white blood cells to excape- the release of fluid causes swelling- body temperature rises- neutrophils and macrophages phagocytize foreign material

Natural Killer Cellsare a type of lymphocyte that limits the spread of tumours and microbial infections. They destroy any foreign cells in the human body.

Macrophages (in the 2nd Layer of Defence)develop from monocytes and phagocytize and remember any foreign cells they encounter. They are found in the liver, brain, lungs, and interstitial fluid.

Memory T-Cell (The Filing Cabinet)do not respond immediately to the antigens they encounter, but store the memory of them and remain in the bloodstream for a quick response the next time the antigen is encountered

Antigensare molecules found on the surface of all cells that the body uses to identify self from non-selfAntibodiesare specialized proteins that recognize and group pathogens for destruction

Helper T-Cell (The Whistle Blower)attaches to a pathogen and alerts other WBC's in the area that there is a foreign substance to be obliterated

Killer T-Cell (The Assassin) identifies its target pathogen (or other foreign substance), zeroes in on it, and eradicates it from the body

Third Layer of Defense: Specialized Defence That Targets Specific Pathogens

Plasma Cellsproduce antibodies to destroy pathogensMemory B-Cellsremember antigens to trigger a response next time the pathogen is encountered

Suppressor T-Cell (The Clean-up Crew)slow or shut down immune system to prevent uninfected tissue from being destroyed by Killer T-Cells once pathogens are eradicated

B Cellsmature in bone marrow. Each type carriers a specific antibody that binds with specific antigens. Once they bind with antigens they divide into plasma cells and memory b cells

Skin: covered in pathogens but prevents entrySweat: acidic sweat and bactericidal oils on the skin kill pathogensTears: flushes out pathogens

By: Lauren and Mary

Macrophages(of the 3rd defense layer): are attracted to antigen tagged antibodies


The Immune System


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