Infectious Dieases

Note by morgihowler, updated more than 1 year ago
Created by morgihowler over 6 years ago


GCSE Biology (Mine) Note on Infectious Dieases, created by morgihowler on 02/17/2015.

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Biology 1 Part 1- Infectious DiseasesMethods of infection Airborne- invade the body by breathing in Broken skin- invade the body through cuts Ingestion- eating contaminated foods introduces infection What are the differences between bacteria and viruses?Bacteria are living, but it is debatable whether viruses are or not, as they cannot carry out any life processes for themselves. Bacteria reproduce rapidly inside the warmth of a body and produce toxins. Viruses insert themselves into host cells and hijack it to make copies. For this reason, there are very few drugs which can be used to kill a virus without harming the cells. However, antibiotics are used to get rid of bacterial infections. What are antibiotics? They are medicines that kill infective bacteria inside the body. How do they work? Specific antibiotics target specific bacteria and kill them so they are unable to spread. How does the body defend against disease?Stomach acid kills microbesMucus traps microbes and cilia sweeps them out Skin stops microbes from enteringTears contain substances that kill bacteria Blood clots at wounds to close entry siteImmune system kills any that get past defencesDo viruses infect other species besides humans?Yes, some infect animals or plants and some live in the sea and infect algae Why do viruses damage the cells?They insert themselves into a host cell and hijack the cells parts, the burst out of the cell to infect others Why is it hard to say whether viruses are living?Because they don't carry out any of the life processes for themselvesWhat does sterile mean?Free from bacteria or any other living microorganisms; totally clean Why should cultures be incubated at a maximum of 25°C in a school laboratory? Body temperature is at 37°C, so any higher than 25°C could allow very dangerous bacteria to grow

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