Examine the Figure Below

question 42

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.