Immunology-part1-four

Immunology-part1-four - 18 18 to pathogens Animal Defense...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
18 Natural Defenses against Disease 18 Animal Defense Systems Humans are nutritious and taste good ! ... to pathogens ! Possible pathogens: viruses bacteria single-cell eukaryotic parasites (yeast) parasitic worms maggots lions? (usually not considered “pathogens”) The immune system is a set of mechanisms that protect an organism from infection by identifying and killing pathogens. Decaying mole: 40 hours compressed to 30 sec http://www.youtube.com/watch?v=cb7wBQIR2_0 What happens in the absence of an immune system? 18 Animal Defense Systems ! The immune system must be absolutely specific and not attack normal cells and tissues. ! Pathogens are constantly evolving new ways to avoid detection by the immune system: the immune system must be adaptive . ! The immune system must recognize and defeat pathogens: " viruses " bacteria " single-cell eukaryotic parasites fungi (yeast) " parasitic worms " maggots
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
18 Animal Defense Systems There are two general types of defense mechanisms: ! Nonspecific defenses, or innate defenses, are inherited mechanisms that protect the body from many different pathogens: The Innate Immune System ! Specific defenses are adaptive mechanisms that protect against specific targets: The Adaptive Immune System Innate immune system Adaptive immune system Response is non-specific Pathogen and antigen specific response Exposure leads to immediate maximal response Lag time between exposure and maximal response Cell-mediated and humoral components Cell-mediated and humoral components No immunological memory Exposure leads to immunological memory Found in nearly all forms of life Found only in jawed vertebrates 18 Who are the players? 18 The players Components of the defense system are distributed throughout the body. Lymphoid tissues (thymus, bone marrow, spleen, lymph nodes) are essential parts of the defense system. ! Blood (closed circulatory system): suspends red and white blood cells and platelets. " Red blood cells are found in the closed circulatory system.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern