pathogens
- Created by: dom
- Created on: 11-05-15 10:42
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- PATHOGENS
- DISEASE
- malfunction of the body which has adverse affects on good health
- PATHOGEN
- microorganism that causes disease
- for a microorganism to be considered a pathogen it must..
- gain entry to host, resist defences of host, colonise tissue of host and cause damage to tissue
- bacteria, virus and fungi
- when a pathogen is transfereed from one person to another = transmission
- how do microorganisms get In the body?
- penetrating one of organisms interfaces with environment
- interface is a surface or boundary linking 2 systems
- skin - when skin is broken - cuts/insect bites etc.
- gas exchange system
- digestive system
- natural defences -
- mucous layer that covers exchange surface to make difficult to penetrate
- enzymes that break down pathogens
- production of stomach acid
- penetrating one of organisms interfaces with environment
- how do pathogens cause disease?
- damaging host tissue
- sheer number of pathogens cause damage - prevent tissue functioning properly
- virus inhibit synthesis of dna and rna
- some pathogens break down membrane
- sheer number of pathogens cause damage - prevent tissue functioning properly
- producing toxins
- most bacteria release toxins
- toxin - harmful substance to the body
- most bacteria release toxins
- damaging host tissue
- DISEASE
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