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Name Science 7__ Date Infectious Diseases Worksheet Infectious Diseases (see HB + H p. 156 – 160) How Infectious Diseases are Spread Source Example of Method of Transfer Direct contact: shaking hands Examples of Diseases Spread in this way 1. Another person 2. 3. Contaminated object or food 4. Animal bite Colds, flu Rabies 5. The environment Contact with pathogen that lives naturally in the soil or water. 6. 7. What are four major groups of human pathogens? 8. Define “infectious disease”. 9. Define and give an example of “pathogens”. 10. Define and give an example of “toxins”. 11. How does surgery today differ from surgery in 1846? 12. What are two ways in which bacteria cause disease? 13. How might people reduce their risk of catching Lyme disease? The Body’s Defenses (see HB+H p. 161 – 169) Complete the concept map: From the list below, choose the term that best completes each sentence. Antibody AIDS Antigen Immune response Inflammatory Response Phagocyte Lymphocyte 9. A marker molecule on a cell that the immune system uses to recognize a pathogen is called a(n):_____________________________. 10. _________________________ is a disease caused by a virus that attacks the immune system. 11. A(n) _________________________ is a white blood cell that engulfs and destroys pathogens. 12. During the _____________________________, blood vessels widen in the area affected by pathogens. 13. In the ___________________________, the body reacts to each kind of pathogen with a defense targeted specifically for that pathogen. 14. A chemical that helps destroy a specific kind of pathogen by locking onto a specific marker molecule is called a(n)____________________________. 15. The type of white blood cell involved in the immune response is a(n) _____________________. Short answer – use complete sentences. 16. What role do white blood cells play in the inflammatory response? 17. What is the function of an antibody? 18. Why does the death of T cells interfere with the body’s ability to fight disease?