1 / 11

Specific Defense Mechanism

Specific Defense Mechanism. Suman Mandal MS in Zoology(Fisheries) Uniersity of Dhaka Bangladesh suman.magician@yahoo.com , www.sumanmagician.yolasite.com. Specific Defense Mechanism. Characteristics Specificity Memory Two specific mechanisms Humoral Immune Response (HIR)

eldora
Download Presentation

Specific Defense Mechanism

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Specific Defense Mechanism Suman Mandal MS in Zoology(Fisheries) Uniersity of Dhaka Bangladesh suman.magician@yahoo.com, www.sumanmagician.yolasite.com. suman.magician@yahoo.com

  2. Specific Defense Mechanism • Characteristics • Specificity • Memory • Two specific mechanisms • Humoral Immune Response (HIR) • Cell-mediated Immune Response (CMIR) suman.magician@yahoo.com

  3. Terminology • Antibodies • Protein produced in response to foreign substances • Can destroy or neutralize antigens • Antigens • Substances that can elicit a specific immune response • Pathogens • Micro-organisms that can cause diseases suman.magician@yahoo.com

  4. Humoral immune response (HIR) • Antigens e.g. bacteria, pollen, animal fur, red blood cells etc • Characteristics • B cells are involved • Results in production of antibodies suman.magician@yahoo.com

  5. Antibodies combat against antigen B Antigen e.g. bacteria, pollen, animal fur, red blood cells, etc Blast cell B B cell Antibody forming cell Plasma cell suman.magician@yahoo.com

  6. Antibodies • Y-shaped • Protein in nature • Two top ends of the ‘Y’ are specific to the particular antigen • Bind to antigen • Help to destroy or eliminate antigens by • Lysis • Enhance phagocytosis • Neutralize bacterial toxins suman.magician@yahoo.com

  7. suman.magician@yahoo.com

  8. Cell-mediated immune response (CMIR) • Antigens e.g. intracellular bacteria, viruses, foreign substances like skin, kidney etc • Characteristics • T cells are involved suman.magician@yahoo.com

  9. T Memory cell T Kill antigen directly Antigen (e.g. bacteria, viruses, foreign substances...) T Killer T cell T cell T Lymphokines Activated T cell Macrophage Activated macrophage suman.magician@yahoo.com

  10. Primary response • Elicited when an antigen entered into the body for the first time • Secondary response • Elicited when subsequent entry by the same antigen • Characteristics • Shorter lag period • Sharper increase and a higher level of antibodies produced • High antibody level stays longer suman.magician@yahoo.com

  11. suman.magician@yahoo.com

More Related