Immune+System+EP

PATHOGENS 1. What is a pathogen? 2. What are the body's three lines of defense against pathogens? 3. Write a one paragraph summary of bacteria. 4. Write a one paragraph summary of viruses. 5. What is an emerging virus? IMMUNE SYSTEM 6. What is an antibody? What do they do? 7. What is B Cell? 8. What is a Cytotoxic T Cell? 9. What is a Helper T Cell? 10. What is an antigen? How does the body respond to an antigen?
 * a germ in the body that could cause infection or disease.
 * [[image:pathogens.jpg]]
 * barriers to entry try and keep pathogens out of the body.
 * first responders white blood cells that help stop an infection
 * specific defenses that over come infection
 * Bacteria does not have a nucleus. bacteria has three common shapes: bacillus which is rod shaped, coccus which is a spherical shape, and spirillum which is curved.A pilus is used to transfer DNA from one cell to the next which bacteria can use to fight antibiotics. they are independent. they can reproduce.
 * [[image:General_Bacteria.jpg]]
 * Viruses are not composed cells. they can cause disease, colds, flu, chicken pox, AIDS, etc. they are about 4 times smaller then bacteria. a virus has two parts: an outer capsid composed of proteins and an inner core of nucleic acid. They have enzymes that help them reproduce.
 * [[image:examples_of_viruses.gif]]
 * A virus emerges by being transported from one location to another where it has never been before. they can be carried through animals.
 * are proteins found in the blood that help fight off bacteria.
 * [[image:antibody.JPG]]
 * they make antibodies.
 * [[image:fcr2b.gif]]
 * [[image:cytotoxicTCell.gif]]
 * a white blood cell that helps get rid of antigens.
 * [[image:newImmuneSystemOverview.gif]]
 * An antigen is something the body had taken in from outside such as bacteria. the body responds with the white blood cells to try and get rid of them.
 * [[image:antigen-present2664.JPG]]