Free Powerpoint Templates Page 1. Free Powerpoint Templates Page 2 Remember: pathogenA pathogen is a micro-organism that has the potential to cause disease.

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Presentation transcript:

Free Powerpoint Templates Page 1

Free Powerpoint Templates Page 2 Remember: pathogenA pathogen is a micro-organism that has the potential to cause disease. infectionAn infection is the invasion and multiplication of pathogenic microbes in an individual or population. DiseaseDisease is when the infection causes damage to the individual’s vital functions or systems. does notAn infection does not always result in disease!

Free Powerpoint Templates Page 3 To make us ill microbes must: reach their target site in the body attach to the target site they are trying to infect multiply rapidly obtain their nutrients from the host avoid and survive attack by the immune system

Free Powerpoint Templates Page 4 Infection enters through: 1.Natural openings in your body Eyes – hand to eye in tear duct to mucus Mouth – attaches to teeth swallow kills most Nose – infect mucus membranes 2.Directly infect your skin 3.Take advantage of breaks in skin 4.Bug bites 5.Animal bites 6.Penetrate skin

Free Powerpoint Templates Page 5 Infection enters through: 1.Natural openings in your body 2.Directly infect your skin Bacteria - Staphylococci, coryneforms Fungi - athlete’s foot, ringworm Viruses - wart viruses live in dead skin cells 3.Take advantage of breaks in skin 4.Bug bites 5.Animal bites 6.Penetrate skin

Free Powerpoint Templates Page 6 1.Natural openings in your body 2.Take advantage of breaks in skin Cuts Catheters Burns 3.Bug bites 4.Animal bites 5.Penetrate skin Infection enters through:

Free Powerpoint Templates Page 7 1.Natural openings in your body 2.Directly infect your skin: 3.Take advantage of breaks in skin 4.Bug bites Bacteria Parasites Viruses 5.Animal bites 6.Penetrate skin Infection enters through:

Free Powerpoint Templates Page 8 1.Natural openings in your body 2.Directly infect your skin: 3.Take advantage of breaks in skin 4.Bug bites 5.Animal bites Rabies 6.Penetrate skin Infection enters through:

Free Powerpoint Templates Page 9 1.Natural openings in your body 2.Directly infect your skin: 3.Take advantage of breaks in skin 4.Bug bites 5.Animal bites 6.Penetrate skin Swimmers itch – larval worms in water Hook worm – larval worms in soil Infection enters through:

Free Powerpoint Templates Page 10 Bacteria – divide Reproduction

Free Powerpoint Templates Page 11 Aids virus budding from a white blood cell. Reproduction Virus - uses host

Free Powerpoint Templates Page 12 The Defenders 1.First line of defence –Skin –Muscus membranes 2.Second line of defence 3.Third line of defence

Free Powerpoint Templates Page 13 The Defenders 1.First line of defence 2.Second line of defence –White blood cells 3.Third line of defence

Free Powerpoint Templates Page 14 The Defenders 1.First line of defence 2.Second line of defence 3.Third line of defence –Immune response, antibody creates antigens which engulf and digest the invader

Free Powerpoint Templates Page 15 Questions 1.What types of invaders cause infection in humans? Give an example of each type 2.Why are viruses not considered to be living things? 3.In your own words, explain what disease is. 4.Identify two ways in which white blood cells protect the body from diseases. page 56

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