Work Hard. Get Smart. On Task. Physician s Name: Class: 8 Date: The Immune System. These organisms that cause disease are called.
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1 Work Hard. Get Smart. On Task 100% Effort Physician s Name: Class: 8 Date: Pen/Pencil Mrs. Bouchard 8 th On time Grade Science Academic Language 1. Many illnesses are caused by living things inside our bodies. You may have heard of them as germs. The Immune System These organisms that cause disease are called. When you have an infectious disease, a a has gotten inside your body and is. Total: / 4 2. There are four major groups of pathogens: 3. Pathogens can spread through: 4. When pathogens attack, our body responds with the. The immune system is responsible for.
2 The Immune System: Reading Activity! DIRECTIONS: Read below with your partner, switching who is the reader and who is the summarizer each paragraph. The cloud should contain the MAIN IDEA of each paragraph. Felt sick recently? You might have been under attack! Many illnesses are caused by living things inside our bodies, called pathogens, that are harming our cells. Fortunately, your body can fight back! When pathogens attack, our body responds with the immune system. The immune system is responsible for defending the body against disease. Fighting disease-causing pathogens is serious work, so your immune system is actually made up of three lines of defense. Let s call the first line of defense the barriers. In the first line of defense, the skin, breathing passages, and mouth and stomach act as barriers. They trap and kill most pathogens we come into contact with. Let s start with your skin. Destructive chemicals in skin oils and sweat destroy many pathogens that land on your skin. The pathogens that remain can t make it through the layers of dead cells that protect the living skin cells underneath. Pathogens can get through the skin if it is cut, but scabs form so quickly that pathogens don t have much time to get in this way. Pathogens can enter your body when you inhale, but the breathing passages of your respiratory system nose, pharynx, trachea and bronchi are armed with mucus and cilia. The sticky mucus traps pathogens, and the cilia sweeps it away to be swallowed and destroyed in your stomach. In addition, sneezing and coughing force pathogens out of your body. Finally, your mouth and stomach of your digestive system can destroy many pathogens you swallow for example, in infected food. Saliva in your mouth contains chemicals that kill pathogens. If the pathogens make it down to your stomach, they will be destroyed by stomach acid.
3 If pathogens get into your body and begin to damage your cells, your body s second line of defense kicks in. The second line of defense is called the inflammatory response. In the inflammatory response, blood vessels widen to send extra blood to nearby tissues. Your blood isn t just made up of red blood cells. Your blood also has disease-fighting white blood cells. In the inflammatory response, when extra blood goes to tissue affected by a pathogen, a type of white blood cell called a phagocyte (fadge-o-sight) attacks pathogens. The phagocyte attacks pathogens by engulfing them by swallowing them whole and breaking them down. If pathogens harm cells enough to cause fever, your third line of defense steps up. The third line of defense is called the immune response. The cells of the immune response can tell the difference between different kinds of pathogens, and react to each kind of pathogen with a targeted response. Remember, white blood cells are disease fighters, and two types of white blood cells play big roles in your immune response. The first are called T cells. The job of a T cell is to recognize what specific kind of pathogen the body is dealing with. There are tens of millions of T cells in your body, looking for different types of pathogens. The T cells then go find the other white blood cell of the immune response, B cells. B cells are able to make substances called antibodies that target specific pathogens. These antibodies attach themselves to pathogens, making it difficult for the pathogens to attach themselves to healthy cells. Antibodies also cause pathogens to clump together, which makes them easy targets for phagocytes to come along and eat up the pathogens! This is a phagocyte of your second line of defense eating a bacterium. You re done with the reading! Nice work! Move on to Level 1!
4 Level 1: Your Lines of Defense! 1. What is the main job of your immune system? First Line of Defense! 2. What is the first line of defense called? 3. What are the three soldiers of your first line of defense? Second Line of Defense! 4. What is the second line of defense called? 5. What is the name of the soldier of your second line of defense? Third Line of Defense! 6. What is the third line of defense called? 7. What is the name of the two soldiers of your third line of defense? Go Check Answer Key #1
5 Level 2: Explain Your Defenses! 1. How does your skin defend against pathogens? 2. How do your breathing passages defend against pathogens? 3. How does your mouth and stomach defend against pathogens? 4. How do the inflammatory response and phagocytes defend against pathogens? 5. How do the immune response, T cells and B cells defend against pathogens? Go Check Answer Key #2!
6 Level 3: Connections and Summary 1. How are your respiratory system and immune system connected? HINT: Think about your first line of defense. 2. How are your digestive system and immune system connected? HINT: Think about your first line of defense. 3. Your blood is part of your circulatory system. How are your circulatory system and immune system connected? HINT: Think about your second line of defense. 4. What is a good analogy for the immune system? What is something you could compare the immune system to, if you wanted to explain it to a 3 rd grader? Be creative? Go Check Answer Key #3! Then Tell Mrs. Bouchard You re Done!
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