Examine the Figure Below

question 21

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) The 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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