Explain the characteristics of bacteria and virus that make them pathogens. Explain how pathogens can be transmitted from person to person. [AC 2.1,2.4 ] with references Q2.The human body has a tiered system of defences to fight against pathogens. Explain the body’s first line of defence and how it prevents pathogens from entering the body.

Q: Differentiate between the three lines of defense, describingexamples of each.

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Q: What is called Acquired immunity?

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Q: Distinguish between active and passive immunity, and explain how each occurs.

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Q: If an individual failed to develop a thymus because of a genetic defect, what would happen to the…

A: Without the development of a thymus, immune responses mediated by antibodies and cytotoxic T cells…

Q: interferons and of NK cells in fighting viruses

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Q: How many types of “foreign molecules” (use the proper term where needed) does each cell recognize?…

A: Antigens can be classified according to their source: Antigens from outside the body Exogenous…

Q: The concentration of which of the following proteins will most likely decrease in association with…

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Q: suppose than individual's arm is cut, and because of this injury, bacteria are able to gain entry to…

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Q: The human body has a tiered system of defences to fight against pathogens. Explain the body’sfirst…

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Q: Discuss the multiple, overlapping functions of the immune system.Which tissues and organs are…

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