Pathogens

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  • Created by: Beth4
  • Created on: 31-12-14 10:20
What is a pathogen?
Microorganism that causes disease by infecting a host
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Define disease
A disorder of structure or function that produces specific symptoms
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For a microorganism to be considered a pathogen it must...
Gain entry to a host, colonise host tissue, resist host defences and damage host tissues
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How are infectious diseases spread?
Transmission, direct and indirect contact, droplet, airborne, faecal oral, vectors (bites and scratches)
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How do pathogens enter the body?
Skin- cuts Gas exchange system-get past mucus lining and cilia in lung epithelium to reach alveoli, droplets inhaled in air. Digestive system-pathogens on food/water reach stomach and small intestine (if not killed by stomach acid)
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Host defences...
Skin, scabs, hairs (trap pathogens),tears, mucus, stomach acid, blood clotting
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How do pathogens cause disease?
Toxins Damaging host tissues/cells-break membranes to release nutirents/replicates in cell and bursts it/ high no. prevents tissues functioning/viruses inhibit synthesis if dna, rna and protiens
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Prokaryotic and eukaryotic- example of cell
Prokaryotic- bacteria eukaryotic-animal, plant, fungi
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Prokaryotic and eukaryotic- size
Prokaryotic-smaller eukaryotic-larger
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Prokaryotic and eukaryotic-genetic material
Prokaryotic-loose, circular dna, NO NUCLEUS eukaryotic-dna in chromosomes in membrane bound nucleus
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Prokaryotic and eukaryotic-ribosomes
Prokaryotic-smaller
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Prokaryotic and eukaryotic-cell membranes
Prokaryotic- around cell eukaryotic-phosolipid bilayer around cell and organelles
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Prokaryotic and eukaryotic-photosynthetic membranes
Prokaryotic-in blue and green algae and photosynthsising bacteria eukaryotic-chloroplasts in plants
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Prokaryotic and eukaryotic-site of respiration
Prokaryotic- mesosome in folding of membrane eukaryotic-mitochondria
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Prokaryotic and eukaryotic-flagella
Prokaryotic-yes eukaryotic-no
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Prokaryotic and eukaryotic-cell wall
Prokaryotic-yes (peptidoglycan) eukaryotic- only in plants and fungi
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Other cards in this set

Card 2

Front

A disorder of structure or function that produces specific symptoms

Back

Define disease

Card 3

Front

Gain entry to a host, colonise host tissue, resist host defences and damage host tissues

Back

Preview of the back of card 3

Card 4

Front

Transmission, direct and indirect contact, droplet, airborne, faecal oral, vectors (bites and scratches)

Back

Preview of the back of card 4

Card 5

Front

Skin- cuts Gas exchange system-get past mucus lining and cilia in lung epithelium to reach alveoli, droplets inhaled in air. Digestive system-pathogens on food/water reach stomach and small intestine (if not killed by stomach acid)

Back

Preview of the back of card 5
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