Examine the Figure Below

question 69

Multiple Choice

Examine the figure below.
Why is only one of the lymphocytes in this diagram activated by the pathogen?

• A)Antigens move through the immune system by diffusion, so the lymphocyte closest to the site of infection binds the antigen first. Once a lymphocyte is activated, it produces chemicals that prevent the activation of other lymphocytes.
• B)Lymphocytes are only activated if all of their receptors are bound by antigens. In this case, there were only enough antigens to fully activate one cell.
• C)Your immune system contains many different lymphocytes, each displaying a different antigen-binding protein. In this case, the antigen only matched the binding protein on the cell that was activated.
• D)Lymphocytes can only be activated by chemicals produced by the innate immune system. Only one of the cells in this diagram has been exposed to these chemicals.

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