What is a pathogen?
A brand of vacuum cleaner
A microorganism with the potential of causing disease by gaining entry to the host, colonise the host's tissues, resist the host's defences and causes damage to host's tissues.
A bacteria, a fungus or a virus
If a pathogen colonises the host's tissues, a disease occurs which then becomes an infection.
How do pathogens enter the body?
Gas exchange system and the digestive system
Digestive system and the circulatory system
Circulatory system and the gas exchange system
None of the above
Pathogens cause disease by damaging the host's tissues and producing toxins.
How do pathogens cause damage to the host's tissues?
By dissolving the cells with toxins
By preventing the tissues to function properly due to the sheer number of pathogens
By transmitting the messages to the wrong cells
By preventing the synthesis of important substances e.g. DNA, RNA and proteins
By breaking down the host's membranes
All diseases have a single cause
How quickly a pathogen causes damage is related to the size of the pathogen before division.
