One of the major roles of macrophages is to introduce foreign proteins found on the microbe, called an antigen, to helper T cells who make antibodies.

Name: One of the major roles of macrophages is to introduce foreign proteins found on the microbe, called an antigen, to helper T cells who make antibodies.
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This is correct. Macrophages function as antigen-presenting cells and present foreign antigens to helper T cells, which then activate B cells to produce antibodies to fight off the invading microbe.

One of the Major Roles of Macrophages Is to Introduce