immunity Response

Immunity Response

The graph below shows the response of the human immune system to exposure to an antigen. Use this graph to answer part a and part b of this question.

1. Describe the events that occur during period I as the immune system responds to the initial exposure to the antigen.
2. Describe the events that occur during period II following a second exposure to the same antigen.
3. Explain how infection by the AIDS virus (HIV) affects the function of both T and B lymphocytes.

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