![Page 1: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/1.jpg)
Immune System
• The body’s primary defense against disease causing pathogens that threaten our homeostasis.
• Can be identified by molecules on their outer surface (antigens)
![Page 2: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/2.jpg)
Antigens• Found on both viruses and
bacteria • Trigger an immune response.• Recognized by body as
invaders.• White blood cells and
antibodies attack.• The body can usually take
care of a virus but antibiotics are often needed to kill bacteria.
![Page 3: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/3.jpg)
White Blood Cell
• Some are specialized to engulf invading pathogens.
• Others produce antibodies – proteins that either attack or mark for killing.
• WBC’s have large nuclei.
![Page 4: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/4.jpg)
• Most antibodies and WBC’s break down soon after having defended the body.
• But some specialized WBC’s remain. These can produce antibodies to fight off later invasions of the same microbes.
• This gives us immunity to viruses such as chicken pox, mumps and measles years later.
![Page 5: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/5.jpg)
Vaccinations• Scientists have discovered that weakened microbes
stimulate the immune system to produce antibodies without making the person sick.
• Vaccines are made from weakened killed or parts of pathogens and injected into the body.
![Page 6: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/6.jpg)
Damage to the Immune System
• Stress and fatigue can lower resistance and open the door to infection by pathogens.
• AIDS weakens the immune system and may leave a person unable to deal with infections and cancer cells.
• People with AIDS often die from secondary infections.
![Page 7: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/7.jpg)
Problems Associated With Immune Response
• Allergies – Your bodies may react to things like foods, insect bites, dust or pollen and produce an immune response.
• The body reacts by releasing histamines which produce an inflammatory response.
![Page 8: Immune System The body’s primary defense against disease causing pathogens that threaten our homeostasis. Can be identified by molecules on their outer](https://reader036.vdocument.in/reader036/viewer/2022081519/56649e5d5503460f94b55ba7/html5/thumbnails/8.jpg)
• Transplanted organs – body detects foreign proteins. Tries to rid body of invader. This is organ transplant rejection.
• Doctor gives immune system suppressing drugs.