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4 Cards in this Set

  • Front
  • Back
Define pathogen
Organism/virus that causes a disease
Explain why antibiotics are effective against bacteria but not against viruses
Viruses rely on host cell (human cell) to carry out their process. It is not possible to block the process without damaging the host cell
Outline the role of skin and mucus membranes in defense against pathogens
- outter layer of skin is rough and forms a physical barrier
- glands of skin secrete lactic and fatty enzymes (surface of skin acidic) which prevent pathogenic bacteria growth
- mucous membranes - soft areas of skin kept moist with mucus (nose, trachea, vagina, urethra)- bacteria killed by lysozome enzyme in mucus
Distinguish antigens and antibiotics
Antibiotics:

- proteins which recognize and bind to specific antigen
- usually bind to 1 specific antigen
- defend body against pathigens by binding to antigens on surface of pathogen and stimulating its distruction

Antigens:
- foreign substances that stimulate the production of antibodies
- wider range of substances