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Title:

Immune System

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Immune System Immune System Body s defense against disease-causing organisms (pathogens) Immune System First line of defense: Barriers that keep pathogens from ... – PowerPoint PPT presentation

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Title: Immune System


1
Immune System
2
Immune System
  • Bodys defense against disease-causing organisms
    (pathogens)

3
Immune System
  • First line of defense
  • Barriers that keep pathogens from entering the
    body
  • Skin
  • Hair and mucus in nose
  • Sneezing and coughing
  • Saliva
  • Stomach acids

4
Immune System
  • Second line of defense
  • General defense when body cells are damaged
  • Inflammatory responsefluid and white blood cells
    leak from blood vessels into surrounding tissue

5
Immune System
  • Second line of defense
  • General defense when body cells are damaged
  • Inflammatory responsefluid and white blood cells
    leak from blood vessels into surrounding tissue
  • White blood cells
  • attack invaders and eat
  • them
  • Phagocytewhite
  • blood cells that engulf
  • pathogens and destroy
  • them by breaking
  • them down

6
Immune System
  • Second line of defense
  • General defense when body cells are damaged
  • Inflammatory responsefluid and white blood cells
    leak from blood vessels into surrounding tissue
  • Interferonssubstances produced by body cells
    when they are attacked by viruses
  • Interfere with the production of new viruses

7
Immune System
  • Third line of defense
  • Immune response distinguishes between different
    kinds of pathogens
  • Macrophageswhite blood cells that patrol the
    body looking
  • for invaders
  • They send
  • off chemical
  • signals to
  • helper
  • T-cells

8
Immune System
  • Third line of defense
  • Immune response
  • Helper T-cells have many
  • jobs
  • Make macrophages better able to kill
  • Call other cells in the immune system to the
    battle
  • This causes fever, swelling and aches
  • Signs that your body is working to fight a
    disease
  • Send chemicals that increase production of
    B-cells
  • Signal killer T-cells where the invader is hiding

9
Immune System
  • Third line of defense
  • Immune response
  • B-cells produce antibodies
  • Proteins produced by the immune system which
    destroy certain kinds of pathogens
  • Antigenthe
  • part of the
  • pathogen that
  • the antibody
  • recognizes and
  • binds to

10
Preventing Disease
  • No cure for viral disease
  • Prevention is the key
  • Vaccinemade from damaged particles that cant
    cause disease anymore

11
Preventing Disease
  • First Vaccine
  • 1798Dr. Edward Jenner
  • Developed a vaccine for smallpox from the cowpox
    virus

The arm of Sarah Nelmes, a dairy maid, who had
contracted cowpox. Jenner used material from her
arm to vaccinate an eight year old boy, James
Phipps (1798).
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