Download 3.6 Immune System

 Student name: ______________________________ Block: _____ Date: _________ 3.6 Immune System If a pathogen makes it past the body’s first line of defense (physical barriers, skin), then the body will mount an immune response to the infection. This is the second line of defense. There are two types of immune response: _INNATE_________ and _ACQUIRED_________. Innate Immune Response The body’s Innate Immune Response is quick and ​
_______________, or non­specific, ​
to the pathogen. White blood cells detect, capture and __________ invading organisms (like amoeba eat food). When an invader is detected by the cells in your body, a chemical signal is released that causes a flow of fluid, cells and dissolved substances from the ________ to the affected area, causing redness, swelling (inflammation) and fever. White blood cells called ​
________________ ​
(from the Greek for “cell eater”) attack the pathogen, breaking them down along with any human cells damaged by the pathogen. Fragments of dead pathogen and white blood cells form _________________​
. Acquired Immune Response The body’s acquired immune response is a complex process that protects us from all forms of threat by remembering pathogens and developing specific mechanisms to prevent them. This is how we become ____________ to a disease. Student name: ______________________________ Block: _____ Date: _________ When a pathogen is detected by your white blood cells they signal for special cells called _________________ that recognize the invader. The Helper T Cells then activate ____________ which make antibodies to bind to the invader and destroy it. Another form of T Cell called Killer T Cells can go to the site of the infection and attack the pathogen directly. The Helper T Cells continue to ____________ the B Cells to produce antibodies until there are no more pathogens. Then the Helper T Cells and the B Cells die to conserve the body’s energy. Special cells called Memory T and Memory B Cells remain alive so that if the same pathogen attacks the body again the body can fight back faster. This is called ____________ immunity, and is why you can only have some diseases, like chickenpox, once. Homework Problems: 1. What are the two types of immune response in the second line of defense? 2. What are the characteristics of the innate immune response? 3. What type of blood cells are involved in the innate immune response? 4. What is the difference between a pathogen and a phagocyte? 5. When you are sick, why does the number of white blood cells in your body increase? 6. Pus around a cut may look bad, but it is a good sign. Explain why. 7. Describe the difference between the first and second lines of defense. 8. What type of blood cells are involved in the acquired immune response? 9. What is the function of antibodies? 10.What do killer T cells do? 11.Arrange the following statements in the correct order to described the acquired immune response to a pathogen. a. Antibodies destroy pathogens. b. B cells mobilize to produce antibodies c. Some memory cells and antibodies remains for future use. d. Pathogen is recognized. 12.How is the function of a helper T cell different from that of a killer T cell?