List four main types of T cells and state their functions?

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Multiple Choice

List four main types of T cells and state their functions?

T cells come in distinct families that handle different parts of the adaptive response. Cytotoxic T cells (CD8+) directly kill virus-infected or abnormal cells, typically by recognizing peptides presented on MHC I. Helper T cells (CD4+) coordinate the immune response by secreting cytokines that stimulate both T cells and B cells. Regulatory T cells suppress excessive activation to prevent autoimmunity and tissue damage. Memory T cells persist after an infection to enable a faster, stronger response if the same antigen is encountered again. The option that assigns these four roles—cytotoxic T cells killing infected cells, helper T cells stimulating T and B cells, regulatory T cells moderating the response, and memory T cells responding to previously encountered antigen—is correct. The other choices misstate who does antibody production, who kills or presents, or who phagocytoses, which helps explain why they’re not right.

T cells come in distinct families that handle different parts of the adaptive response. Cytotoxic T cells (CD8+) directly kill virus-infected or abnormal cells, typically by recognizing peptides presented on MHC I. Helper T cells (CD4+) coordinate the immune response by secreting cytokines that stimulate both T cells and B cells. Regulatory T cells suppress excessive activation to prevent autoimmunity and tissue damage. Memory T cells persist after an infection to enable a faster, stronger response if the same antigen is encountered again. The option that assigns these four roles—cytotoxic T cells killing infected cells, helper T cells stimulating T and B cells, regulatory T cells moderating the response, and memory T cells responding to previously encountered antigen—is correct. The other choices misstate who does antibody production, who kills or presents, or who phagocytoses, which helps explain why they’re not right.

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