1. What is a pathogen?
- Bacteria that invades the body
- A microorganism that causes disease
- A microorganism that causes infection
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2. Why are the respiratory and digestive systems the most common sites of entry for pathogens?
- The immune system is weak in these systems
- They are easy for the microorganisms to colonise
- Diffusion takes place here - so they have a large surface area, have a good blood supply and are thin so that the pathogens can easily attach to them and penetrate
- They are large organs
3. The purpose of enzymes is to break down the invading pathogens
4. How do pathogens cause disease?
- by resisting the host
- by damaging host tissues and producing toxins
- by colonising the host
5. How is a person defined as being infected?
- If a pathogen gains entry to the host and colonises its tissue
- If a pathogen resists the defences of the host
- If a pathogen causes damage to the host tissue