Defending ourselves against disease
- Created by: armykid795
- Created on: 22-03-15 15:45
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- Defending ourselves against disease.
- Pathogens
- Virus
- Reproduce
- All are pathogenic
- Smaller than bacteria.
- Take over and destroy cells.
- Reproduce
- Rarely release toxins.
- Bacteria
- Only some are pathogenic
- Single celled and smaller than animal and plant cells
- Binary Fussion.
- May produce poisons.
- Virus
- Ways to prevent spreading infections: Hand washing Disinfectants Cleaning
- Defence
- 1st line
- Skin-acts like a barrier
- Blood clots and forms a scab
- Mucus
- Stomach acid
- 2nd line
- White blood cells
- Lymphocytes
- Produce antibody and they attach to the antigen
- Antibodies are protiens that kill BOTH bacteria and viruses
- Antibiotics are drugs that kill ONLY bacteria in the body
- Antiseptic is a liquid which kills micro-organisms in the environment
- Antibodies are protiens that kill BOTH bacteria and viruses
- Produce antitoxins. These counteract the toxins
- Produce antibody and they attach to the antigen
- Phagocytes
- Engulf and digest the pathogen
- Lymphocytes
- White blood cells
- 1st line
- How are diseases spread?
- Direct contact
- Droplet infection
- Contaminated food and drink
- Break in the skin
- Pathogens
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