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Published byLee Barber Modified over 9 years ago
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The Body At War
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Disease Infectious Spread from one organism to another Common cold, influenza, chickenpox Pathogens requiring a host organism Non-Infectious Developed within organism Arthritis, diabetes
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Microbes Microscopic organisms Viruses Bacteria Protozoans Parasites Fungi PATHOGENS are harmful microbes.
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Viruses Seen with an electron microscope H3N2 Bird Flu Electron Microscope Cross Sections CGI Molecular Model
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Viruses Need a host to live
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Myxomatosis Affects rabbits, but not humans
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Warts
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Rubella
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Mumps
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Polio
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AIDS
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Bacteria Seen under light microscope Single cell organism
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Useful Bacteria Organic matter decomposers Cheese and wine
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Binary Fission
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Bacteria Causes Disease They may produce a substance toxic to the host cells They may stop the host from doing normal activities
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Food Poisoning
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Strep Throats
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Pneumonia
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Pimples
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Anthrax
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Leaf Blight
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Questions 1Diseases can be divided into two groups. What are the groups called? 2What is a pathogen? 3Not all bacteria are pathogens. Describe two ways in which bacteria can be useful. 4What are the two ways that bacteria can cause disease?
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Questions 5What is the difference between the way that viruses and bacteria reproduce? 6Why is the cell invaded by a virus called a host cell? 7Over two million bacteria are found per square centimetre of skin under the armpits. Why don’t they cause disease more often?
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Homework 1How does dental cavities or tooth decay form? Why is this related to a study of diseases? 2Often, after taking medicine or being ill, people are advised to eat yoghurt. Find out what the benefits of this food might be. How is yoghurt made?
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Parasites Internal or external Protozoans – single celled animals e.g. malaria, dysentery Tapeworm + Roundworm Liver flukes Fleas Lice
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Common Parasites ParasiteCondition Caused Source of Infection AmoebadysenteryFood and drink Malarial parasitemalariamosquito TapewormtapewormRaw meat Blood flukeschistosomiasiswater TicksSkin infectionScrub, bush LicepediculosisBeds, clothes FleasSkin irritationanimals
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Questions 1What is a parasite? 2What is a protozoan? List some diseases caused by protozoans. 3What are some common tapeworms and roundworms that infect humans? How do we get infected. 4What is the difference between ticks, lice and fleas?
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Review 1What is the difference between a bacteria, animal and plant cell? 2How are some bacteria good? Describe them.
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Links Follow the links to help answer your questions. Cells Alive.com The difference between bacteria, animals and plants Good bacteria Parasite Images Worm Learn.com Lots of images!!!
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