L05 - How Does The Body Prevent Infection PDF

How does the body prevent Saturday 4 Ja nuary 2025 infection? 1 What do we call diseases that are Communicable diseases spread by a pathogen? (infectious) 2 Wh...

How does the body prevent Saturday 4 Ja nuary 2025 infection? 1 What do we call diseases that are Communicable diseases spread by a pathogen? (infectious) 2 What type of pathogen lives and viruses reproduces inside living cells? 3 How do some bacteria damage Produce toxins tissues? Physical, mental and social well 4 What three factors are needed for being “good health?” Poor health makes us more 5 Does poor health effect our chances likely to suffer infectious of catching an infectious disease? diseases CHALLENGE: Describe the effects of alcohol and smoking on health  Title: How does the body prevent infection? Prior …………………………………………. Today Leads to Knowledge Learning Intention: Learning Intention: Describe the Explain non-specific Recall how bacteria bodies defense and viruses reproduce barriers defend the system body against quickly in the body Word 1, Word 2, Word 3  Key word ….... Show me…… 1) 2) 3) Activating prior knowledge: Viruses Bacteria Activation & check of prior knowledge: SARS-CoV-2 is the virus that causes Covid 19. Which statement about the SARS- CoV-2 virus is not true 1) The SARS-CoV-2 virus releases 2) SARS-CoV-2 virus is not alive toxins that damage body tissues because it is not made of cells 3) The SARS-CoV-2 virus can only 4) The SARS-CoV-2 virus destroys replicate inside an animal cell the body cells it infects Activating prior knowledge: Viruses Bacteria 1. SARS-CoV-2 is viral 3. Gonorrhoea is 5. Salmonella is a pathogen it caused by a bacteria vomiting disease damages body cells which harms the caused by a bacteria by body by which harms the a) attacking cells, a) attacking cells, body by reproducing inside reproducing inside a) attacking cells, them and then them and then reproducing inside destroying them destroying them them and then b) reproducing rapidly b) reproducing rapidly destroying them inside the body and inside the body and b) reproducing rapidly releasing toxins releasing toxins inside the body and releasing toxins 2. A common cold is 4. Measles is viral caused by a virus pathogen. It is 6. Bacterial meningitis which harms the caused by a virus is caused by a body by and damages body bacteria which a) attacking cells, cells by harms the body by reproducing inside a) attacking cells, a) attacking cells, them and then reproducing inside reproducing inside Non-Specific Defence Skin Systems Hairs in nose Cilia in trachea and bronchi Stomach The skin is one barrier against disease. Which pathogens can be blocked from entering the body by our skin? 1) The bacterial pathogen 2) The viral bacteria SARS-CoV-2 salmonella 3) The virus measles 4) All of the above Cilia – “hair  How does the body prevent infection? The statements are about barriers to disease. Our noses contain long hairs called cilia FAL Cells lining our trachea and bronchi have cilia which push mucus towards the lungs SE FAL Mucus is a sticky liquid which traps pathogens SE TRU Cilia push mucus out of the body E TRU Tar from cigarettes can coat cilia stopping them working E TRU CHALLENGE: Explain why any incorrect statements are false E Stomach acid  Complete first: Complete once checked blue box The human body has barriers which answers: 1. Is human skin a specific or non- make it more difficult for pathogens to specific defence against pathogens? enter the body. These include our skin Non specific and defences of the gas exchange and 2. What does a barrier to pathogens digestive system. These barriers are being “non-specific” mean? (specific / non-specific) as they work Works on more than one type of on more than one type of pathogen. pathogen 3. How do cilia and mucus in the Skin: stops bacteria or viruses trachea act as a non-specific barrier entering tissues inside the body Mucus to traps pathogens infection? where they could reproduce (slowly Cilia beat and move mucus out / rapidly) of body Stomach acid (destroys / traps) 4. What is the main barrier to infection pathogens that reach the stomach. Stomach in acid destroys the digestive system? (cilia / hair) in our nose and (cilia / pathogens hair) on cells lining the trachea and bronchi. Our air ways also produce a sticky mucus. (cilia / hair) “beats” CHALLENGE: Explain pushing mucus which (and barriers would be effective against the following trapped pathogens. A) Measles pathogens) up and virus out ofspread our by droplets in air, b) Salmonella bacteria found I do: How do non-specific barriers We do: How do non-specific defend the body against the barriers defend the body against airborne cold virus the salmonella bacteria found on If a cold virus enters the body it some food will be able to reproduce If a salmonella ____________ rapidly. enters the body it will be able The virus will attack cells, to reproduce _________. reproduce inside them then The bacteria will __________ destroy the cells. ___________ and damage body Our skin blocks most viruses tissue. from entering the body and Our _____ blocks most bacteria infecting us from entering the body and Cilia and mucus in our trachea infecting us and bronchi trap and remove Stomach acid will ________ most viruses we breath in. bacteria pass through the You do How do non-specific You do: How do non-specific barriers defend the body against barriers defend the body against the norovirus found on some the TB bacteria spread through foods the air If a cold virus enters the body it If a bacteria enters the body it will be able to reproduce will be able to reproduce rapidly. rapidly. The virus will attack cells, The bacteria will release toxins reproduce inside them then and damage body cells. destroy the cells. Our skin blocks most bacteria Our skin blocks most viruses from entering the body and from entering the body and infecting us infecting us Cilia and mucus in our trachea Stomach acid will destroy most and bronchi trap and remove viruses pass through the bacteria we breath in. digestive system. Independent Practice