March 22nd, 2016 Persepolis by: Marjane Satrapi

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Directions: ANSWER USING COMPLETE SENTENCES! Use the information you have been given to answer questions about: The Immune System

Level#1: The immune system defends against pathogens, or disease-causing substances. The immune system contains different kinds of cells and molecules that fight against pathogens in different ways. One type of cell that is part of the immune system is the white blood cell. For example, when a pathogen enters the body, the white cell finds it. They enter the tissue that is infected and attack the pathogen.

1. What happens when a pathogen enters the body?





2. What do white blood cells do when they find a pathogen?





3. What does the immune system do and what is one type of cell that is part of it?







Level#2: The immune system defends against pathogens, or disease-causing substances. The immune system contains different kinds of cells and molecules that fight against pathogens in different ways. One type of cell that is part of the immune system is the white blood cell. For example, when a pathogen enters the body, the white cell finds it. They enter the tissue that is infected and attack the pathogen. There are two special kinds of white blood cells ( T cells and B cells) called lymphocytes. They are part of the lymphatic system. They are also part of the immune system because they help the body fight disease. T cells identify pathogens. Then, they may attack the pathogens. T cells also attack the damaged body cells that the pathogens have already harmed.

1. Which two special kinds of cells are both part of the lymphatic system and the immune system?






2. What do T cells do to pathogens?






3. What do T cells do to damaged body cells?








Level#3: The immune system defends against pathogens, or disease-causing substances. The immune system contains different kinds of cells and molecules that fight against pathogens in different ways. One type of cell that is part of the immune system is the white blood cell. For example, when a pathogen enters the body, the white cell finds it. They enter the tissue that is infected and attack the pathogen. There are two special kinds of white blood cells ( T cells and B cells) called lymphocytes. They are part of the lymphatic system. They are also part of the immune system because they help the body fight disease. T cells identify pathogens. Then, they may attack the pathogens. T cells also attack the damaged body cells that the pathogens have already harmed. Other times, T cells do not attack the pathogens directly. Instead, they stimulate B cells to produce substances called antibodies. Antibodies find certain pathogens and attach to them like a flag. This attachment makes it easier for other cells of the immune system, such as white blood cells, to identify pathogens. Then, the other cells find the pathogens and attack them.

1. Explain what T cells identify, and what they may attack.






2. Explain the other things that T cells do as part of the immune system.






3. Explain what else T cells do and what antibodies do as part of the immune system.









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