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The Immune System

The Immune System. The Job of the I mmune System. The immune system protects our bodies from a variety of pathogens (organisms that cause diseases). Types of Pathogens *Virus- ultramicroscopic infectious agent that replicates itself only within cells of living hosts.

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The Immune System

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  1. The Immune System

  2. The Job of the Immune System The immune system protects our bodies from a variety of pathogens (organisms that cause diseases).

  3. Types of Pathogens*Virus-ultramicroscopic infectious agent that replicates itself only within cells of living hosts.

  4. *Carcinogens- any substance that produces cancer.

  5. *Pollution-undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities .

  6. *Germs- microbe: a minute life form (especially a disease-causing bacterium)

  7. is a poisonous substance produced by living cells or organisms. *Toxins-

  8. *Fungi- including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plants.

  9. *Bacteria- single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll.

  10. *Parasites- an animal or plant that lives in or on a host (another animal or plant); it obtains nourishment from the host without benefiting or killing the host.

  11. How Diseases are Spread *Person to person -Direct physical contact (kissing, hugging, shaking hands). -Indirect contact such as sneezing and coughing. *Contaminated Objects -Water and food -Using towels and silverware -Contaminated nail *Animal Bites -Animals biting a person can transfer the pathogen. *The environment -Naturally occurring in soil and water.

  12. How does the body defend itself? • Barriers -Breathing passages • Skin • Mouth and stomach

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