Helper T cells become activated by _____ that was engulfed and digested by a phagocyte.

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Helper T cells are activated by antigens, which are foreign substances that trigger an immune response. These antigens are typically ingested and digested by a phagocyte, which then presents the antigen to the helper T cells. The helper T cells recognize the antigen and become activated, initiating a cascade of immune responses. Cytotoxic T cells are involved in killing cells infected with viruses, and erythrocytes are red blood cells that do not play a role in immune responses. Complement is a group of proteins that help to destroy pathogens, but they do not directly activate helper T cells.

Helper T Cells Become Activated by _____ That Was Engulfed